Indulge in the ultimate nostalgic treat with our rich, vibrant Homemade Cosmic Brownies. These fudgy, chocolatey delights, crowned with a luscious ganache and a rainbow of colorful sprinkles, are an irresistible copycat of the beloved Little Debbie classic. Prepare to be enchanted by a dessert that’s truly out of this world!
Our Ganache Topped Cosmic Brownies offer a decadently fudgy texture and a vibrant array of rainbow sprinkles, making them a hit with kids and adults alike. This recipe captures the magic of the iconic snack, elevated with homemade goodness for an unforgettable chocolate experience.

Why These Homemade Cosmic Brownies Are a Must-Bake
Craving a nostalgic trip down memory lane? Our Homemade Cosmic Brownies are more than just a dessert; they’re an experience designed to delight. Here’s why you absolutely need to add this recipe to your baking repertoire:
- Better Than the Original Little Debbie: While we all love the classic, this homemade version takes everything you adore about Little Debbie Cosmic Brownies and elevates it. You get a deeper chocolate flavor, a richer fudgy texture, and the satisfaction of knowing exactly what goes into every delectable bite. It’s a copycat recipe that truly surpasses its inspiration.
- Ultimate Fudgy Perfection: If your heart beats for rich, dense brownies crowned with a truly fudgy frosting, then look no further. This recipe is specifically engineered for that coveted melt-in-your-mouth texture. Each square promises a chewy, dense center that is impossible to resist, perfectly complemented by the smooth ganache topping.
- A Chocoholic’s Dream Come True: This recipe is a double dose of chocolate heaven. The brownie base is crafted with premium cocoa powder, delivering a robust, deep chocolate flavor. Then, they are generously topped with a silky ganache made from high-quality semisweet chocolate chips, ensuring an intense chocolate experience that will satisfy even the most ardent chocolate lovers.
- Iconic Rainbow Sprinkles: What are Cosmic Brownies without their signature vibrant sprinkles? Our recipe ensures you get that authentic, playful look with a generous showering of rainbow chip sprinkles. These aren’t just for decoration; they add a delightful crunch and that unmistakable visual appeal that makes these brownies instantly recognizable and incredibly fun.
- Perfect for Any Occasion: Whether you’re hosting a birthday party, bringing a treat to a potluck, or simply want to brighten a mundane Tuesday, these brownies are a crowd-pleaser. Their vibrant appearance and irresistible taste make them ideal for celebrations, school lunches, or just a comforting homemade snack.
- Easy to Follow Steps: Don’t be intimidated by the delicious outcome; this recipe is designed to be straightforward and approachable for bakers of all skill levels. With clear, step-by-step instructions, you’ll be whipping up these cosmic treats in no time.
The Out-of-This-World History of Cosmic Brownies
Have you ever wondered about the origin of those iconic chocolate squares with the colorful sprinkles? The story behind Little Debbie Cosmic Brownies is as charming as the snack itself. Personally, I didn’t grow up with them and always wondered why they weren’t part of my childhood snack memories. It turns out, there’s a good reason!
These delightful treats weren’t introduced until December of 1999. By that time, I was already a busy parent of three, and my grocery store visits often involved a focused mission to avoid the tempting snack aisle – especially when little hands were involved. So, while other kids were discovering this new craze, I was likely navigating the demands of parenthood.
Little Debbie developed Cosmic Brownies to tap into a popular cultural phenomenon of the late 90s: cosmic bowling. This trend transformed traditional bowling alleys into vibrant, glow-in-the-dark environments, complete with disco lights, upbeat music, and a general futuristic vibe. It was a novel way to socialize and have fun, and I distinctly remember the excitement surrounding cosmic bowling. The name “Cosmic Brownies” and their signature colorful, irregularly shaped “cosmic” sprinkles were a direct nod to this trend, aiming to capture the same sense of fun and modernity. The sprinkles, often resembling mini candy-coated chocolates, were chosen to evoke stars twinkling in a night sky, perfectly aligning with the “cosmic” theme. This strategic marketing helped the brownies quickly gain popularity and cement their place as a beloved snack for a new generation.
Essential Ingredients for Perfect Cosmic Brownies
Crafting the perfect homemade Cosmic Brownies requires attention to detail with each ingredient. Here’s a closer look at what you’ll need and why each component is crucial for achieving that authentic fudgy texture and rich chocolate flavor:
- Kitchen Staples: Butter, Sugar, Brown Sugar – These form the foundational sweetness and texture of your brownies. Using a combination of granulated sugar and brown sugar ensures a balanced sweetness and contributes to the fudgy chewiness. Melted butter creates a dense, moist brownie base that’s less cake-like.
- Eggs (Large, Room Temperature): Large eggs are standard for baking recipes. Crucially, ensure your eggs are at room temperature. This allows them to emulsify more easily with the butter and sugar, creating a smoother batter and a more uniform, tender crumb in the final brownie. If you forget, a quick warm water bath can bring them to temperature quickly.
- Coffee (or Instant Coffee): Don’t skip this! Coffee doesn’t make your brownies taste like coffee; it enhances and deepens the chocolate flavor, making it more robust and complex. I prefer using instant coffee granules mixed with a small amount of hot water for convenience, but leftover brewed coffee works beautifully too.
- Vanilla Extract: Always opt for real vanilla extract over imitation. Its warm, aromatic notes are essential for rounding out the chocolate flavor and adding a layer of sophisticated sweetness.
- Unsweetened Cocoa Powder: This is the backbone of your brownie’s chocolate flavor. Use regular unsweetened cocoa powder, not Dutch-processed, unless the recipe specifically calls for it. Dutch-processed cocoa is less acidic and interacts differently with leavening agents, which can affect the texture and rise of your brownies. Avoid hot cocoa mix, as it contains sugar and milk solids that will throw off the recipe’s balance.
- Espresso Powder: Similar to coffee, a touch of espresso powder dramatically intensifies the chocolate flavor without imparting a distinct coffee taste. It’s a secret weapon for serious chocoholics! Keep instant espresso powder on hand for baking.
- All-Purpose Flour: Measure your flour accurately, preferably by weight, or use the spoon-and-level method to avoid adding too much, which can lead to dry, cakey brownies.
- Cornstarch: This is a key ingredient for achieving that desirable tender and chewy texture. Cornstarch helps to reduce the amount of gluten development in the flour, resulting in a softer, more delicate crumb. Just a tablespoon can make a noticeable difference in chewiness.
- Baking Powder: Essential for a slight lift and tender texture, baking powder is different from baking soda and they are not interchangeable. Always check the expiration date on your can, as baking powder loses its potency over time. You can test its freshness by mixing a spoonful in hot water; if it bubbles vigorously, it’s still good.
- Semisweet Chocolate Chips (for Ganache): I highly recommend using a good quality brand like Ghirardelli semisweet chocolate chips for the ganache. High-quality chocolate melts smoothly and provides a rich, decadent topping.
- Heavy Cream (for Ganache): Use heavy cream with at least 36% butterfat content. This richness is what creates a luscious, silky-smooth ganache that sets beautifully and adds to the luxurious feel of the brownies.
- Rainbow Chip Sprinkles: These are the iconic topping that gives Cosmic Brownies their distinctive look. While mini M&M’s or other small, colorful candies can be substituted, the unique, slightly irregular shape of rainbow chip sprinkles truly gives them that authentic “cosmic” appearance. You can often find them in baking aisles or specialty craft stores.

Step-by-Step Guide to Crafting Perfect Homemade Cosmic Brownies
These Little Debbie copycat brownies are so rich and utterly delicious, they’re practically irresistible. I once found out my husband, in a moment of breakfast desperation, opted for a Cosmic Brownie over toast when we ran out of bread! While I wouldn’t endorse it as a healthy substitute, it certainly speaks volumes about their addictive quality. Here’s a detailed guide to making your own batch of these incredible treats:
- Prepare Your Pan with Precision: Start by lining a square baking pan (preferably 8×8 inches) with non-stick foil, ensuring some overhang on the sides. This thoughtful step is crucial for effortlessly lifting the cooled brownies out of the pan, making cutting a breeze and preventing any sticking. If you don’t have non-stick foil, regular foil sprayed generously with non-stick cooking spray will work just as well.
- Mix Brownie Ingredients Mindfully for Fudgy Results: Follow the recipe precisely for combining your brownie batter. The golden rule for achieving incredibly fudgy brownies is to avoid overmixing. Overmixing develops too much gluten in the flour and incorporates excessive air, which leads to a cakier, drier texture rather than the dense, chewy fudginess we crave. Mix just until the ingredients are combined, leaving a few streaks of flour is perfectly fine. Resist the urge to use a mixer on high speed after adding flour.
- Utilize Room Temperature Eggs: As mentioned in the ingredient notes, using room-temperature eggs is vital. They incorporate more easily into the butter and sugar mixture, creating a smoother, more homogenous batter. This leads to a more consistent and tender brownie texture throughout.
- Scrape and Spread Evenly: Once your luscious brownie batter is mixed, scrape it completely into the prepared pan. Use an offset spatula to gently and evenly spread the batter to all corners of the pan, smoothing the top. This ensures even baking and a consistent thickness for all your brownies.
- Bake to Perfection: Bake according to the recipe’s instructions. Keep an eye on the baking time, as oven temperatures can vary. If you’re using a 9×9-inch pan instead of an 8×8-inch, your brownies will be slightly thinner, so you’ll need to reduce the baking time by a few minutes to prevent over-baking.
- Test for Doneness Accurately: To determine if your brownies are perfectly baked, insert a toothpick into the center. It should come out clean or with just a few moist crumbs attached. If it comes out with wet batter, continue baking for a few more minutes. If it’s completely dry, you may have overbaked them.
- Cool Completely (or at least 30 minutes): Allow the brownies to cool in the pan on a wire rack for at least 30 minutes before you even think about making the ganache. This allows them to set properly and prevents the ganache from melting or sliding off. For best results, let them cool completely.
- Master the Ganache: For the fudgy ganache topping, combine your semisweet chocolate chips and heavy cream in a microwave-safe bowl. Microwave in short bursts (30-60 seconds), stirring well after each interval, until the mixture is smooth and glossy. Be careful not to overheat. Once smooth, pour it generously over the cooled brownies.
- Sprinkle with Cosmic Charm: Immediately after pouring the ganache, liberally sprinkle with your rainbow chip sprinkles, mini M&M’s, or other round chocolate-covered candies. Press them gently if needed to adhere to the still-wet ganache. Allow the ganache to set completely, ideally by chilling the brownies in the refrigerator for at least 2 hours, or until firm, before cutting.
Expert Tips for Perfectly Slicing Cosmic Brownies
Cutting brownies, especially those adorned with small, colorful candies, can sometimes feel like a daunting task if you’re aiming for neat, uniform squares. While achieving absolute perfection can be challenging, I’ve gathered some indispensable tips that will help you get beautifully presented Cosmic Brownies every time. Say goodbye to crumbly edges and scattered sprinkles!
- Score While Slightly Chilled: The key to clean cuts is timing. After your brownies have chilled for about 30 minutes in the refrigerator, but before the ganache is fully set and rock-hard, gently score the top of the brownies. Use the tip of a sharp knife or a ruler to lightly mark where you intend to cut. This initial scoring creates a guideline and allows you to strategically move any sprinkles out of the way before making the final, deeper cuts. This prevents the sprinkles from dragging and messing up your lines.
- Master the Grid for Even Portions: This recipe yields 16 delicious brownies. To achieve this, visualize your pan as a grid. First, make one decisive cut straight down the middle of the pan in one direction. Then, give the pan a quarter turn and repeat, cutting down the middle again. You should now have 4 perfectly equal large squares. Next, divide each of these 4 larger squares into 4 smaller, equal squares. This systematic approach ensures consistent sizing across all your brownies.
- Chill to Firmness: Once you’ve scored and marked your brownies, return the pan to the refrigerator. Allow them to chill for at least another 1-2 hours, or until the ganache and brownie layers are completely firm. This firmness is crucial for clean, sharp cuts without smudging the ganache or causing the brownie to crumble.
- The Sharp Knife & Clean Wipe Technique: When you’re ready to make the final slices, grab your sharpest, thin-bladed knife. A hot knife can also work wonders – run it under hot water and wipe it dry between each cut. The most important tip, however, is to wipe the knife clean after *every single cut*. This removes any residual ganache and brownie crumbs, ensuring that each subsequent cut is as clean and precise as the last. This step is non-negotiable for professional-looking slices. Gently push down and slice rather than saw to avoid tearing the brownie.

Frequently Asked Questions About Cosmic Brownies
Adding cornstarch is a clever baker’s trick for achieving a superior brownie texture. Primarily, it helps to cut down on the amount of gluten that develops in a brownie recipe, compared to using more flour. Less gluten results in a significantly more tender and soft brownie, preventing it from becoming too cake-like or tough. Additionally, many experienced bakers, including myself, find that even just a tablespoon of cornstarch can enhance the chewiness of the brownie, contributing to that irresistible fudgy bite that defines a truly great brownie. It’s a small addition with a big impact on texture!
Rainbow chip sprinkles are the distinctive, bright, and uniquely shaped candy-coated chocolate pieces that are the hallmark garnish of classic Cosmic Brownies. Unlike typical symmetrical sprinkles (like jimmies or nonpareils), these “chips” have an irregular, almost chipped-off appearance, giving them their characteristic charm and vibrant appeal. This distinctive look is what makes them “cosmic”! They provide a delightful textural contrast to the smooth ganache and fudgy brownie. You can often find Wilton brand rainbow chip sprinkles at craft stores like JoAnn Fabrics and Michael’s, or keep an eye out for Betty Crocker’s version, which may be available in the baking aisle of larger grocery stores. Some specialty online baking stores also carry them.
Proper storage is key to keeping your homemade Cosmic Brownies fresh and delicious. These brownies keep exceptionally well at room temperature when stored in an airtight container for up to 3 days. To prevent them from sticking together or disturbing the ganache and sprinkles, place a piece of parchment paper or wax paper between stacked layers of brownies. If you plan to keep them longer, transfer them to the refrigerator, where they will stay fresh for up to a week. For longer-term storage, Cosmic Brownies freeze beautifully for up to 3 months. Wrap individual brownies or small batches tightly in plastic wrap, then place them in an airtight freezer-safe container or bag. To serve, defrost them in the refrigerator overnight, or at room temperature for a few hours, before enjoying.
While you can use Dutch-processed cocoa powder, it’s generally not recommended for this recipe unless you prefer a slightly different flavor profile and texture. Natural unsweetened cocoa powder, as called for, is acidic and reacts with the baking powder to create lift and a specific brownie texture. Dutch-processed cocoa is non-acidic and will result in a denser, darker brownie with a milder, less complex chocolate flavor. For the classic Cosmic Brownie experience, stick to natural unsweetened cocoa.
Ganache consistency is crucial! If your ganache is too thick after whisking, you can gently warm it again in the microwave for 10-15 seconds at a time, stirring well after each interval, until it reaches a pourable consistency. If it’s too thin, you can try chilling it in the refrigerator for 10-15 minute increments, stirring occasionally, until it thickens slightly. Alternatively, you can melt a few more chocolate chips and stir them in, or for a very thin ganache, add a tiny bit more cream to thin it further, though this is rarely needed.
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Cosmic Brownies Recipe (Copycat Little Debbie)
15 minutes
25 minutes
40 minutes
16 brownies
Indulge in these rich, fudgy, homemade Cosmic Brownies, featuring a decadent chocolate ganache topping and iconic rainbow candy sprinkles. A perfect copycat of the classic Little Debbie treat!
Ingredients
For the Fudgy Brownies:
- ¾ cup unsalted butter (1 ½ sticks), melted
- 1 cup granulated sugar
- ⅔ cup light brown sugar, packed
- 2 large eggs, at room temperature
- 3 tablespoons brewed coffee (or instant coffee dissolved in a little hot water)
- 2 teaspoons pure vanilla extract
- ¾ cup unsweetened cocoa powder (natural, not Dutch-processed)
- 1 teaspoon instant espresso powder mixed in 2 tablespoons of hot water (optional, but enhances chocolate flavor)
- ¾ cup all-purpose flour
- 1 tablespoon cornstarch
- ½ teaspoon baking powder
For the Silky Ganache Topping:
- 1 ½ cups semisweet chocolate chips (high quality recommended, e.g., Ghirardelli)
- ½ cup heavy cream (36% butterfat)
- ½ cup Rainbow Chip Sprinkles, mini M&Ms, or other small colorful chocolate candies (adjust amount to your preference)
Instructions
- Preheat your oven to 350ºF (175ºC). Prepare an 8×8-inch (20×20 cm) baking pan by lining it with non-stick foil, leaving an overhang on all sides for easy removal. If using regular foil, make sure to spray it thoroughly with non-stick cooking spray. Set the prepared pan aside.
- In a large, microwave-safe bowl, melt the butter in 30-second increments, stirring after each, until fully liquid. Be careful not to overheat.
- Add both granulated sugar and brown sugar to the melted butter and stir vigorously until well combined. Then, incorporate the room-temperature eggs, coffee, and vanilla extract. Stir until the mixture is thoroughly blended and smooth.
- Next, whisk in the cocoa powder and the dissolved espresso mixture (if using). Continue to whisk until the batter is smooth and free of any lumps of cocoa powder.
- Add the all-purpose flour, cornstarch, and baking powder to the wet ingredients. Gently stir until the dry ingredients are just incorporated. Be very careful not to overmix the batter; overmixing will result in a tougher, more cake-like brownie texture rather than fudgy.
- Pour the prepared brownie batter into your lined baking pan, ensuring it’s evenly distributed. Use an offset spatula or the back of a spoon to lightly smooth the top surface of the batter. Bake for 28 to 30 minutes. The brownies are done when the edges look set and a toothpick inserted into the center comes out clean or with only a few moist crumbs attached (no wet batter). Remove from oven and cool completely on a wire rack.
- While the brownies are cooling (allow at least 30 minutes, ideally completely cool), prepare the chocolate ganache. Place the chocolate chips and heavy cream into a medium, microwave-safe bowl. Microwave on high power for one minute. Do not stir immediately.
- Allow the mixture to stand undisturbed for a few minutes (about 2-3 minutes) to allow the chocolate to fully melt. Then, gently whisk the mixture until it becomes completely smooth and glossy. If any small lumps of chocolate remain, microwave for an additional 15 seconds and whisk again until perfectly smooth. Repeat if necessary, but avoid overheating.
- Pour the warm, smooth ganache over the completely cooled brownies in the pan. Use an offset spatula to gently spread the ganache evenly to all edges. Immediately after spreading the ganache, liberally sprinkle with your rainbow chip sprinkles or other colorful candies. Chill the brownies in the refrigerator for at least 2 hours, or until the ganache is fully set and firm, before cutting.
Notes
Recommended Baking Products
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- Rainbow Chip Sprinkles
- Set of Glass Mixing Bowls
- 8 x 8-inch Baking Pan
Nutrition Information:
Yield:
16 servings
Serving Size:
1 brownie
Amount Per Serving (estimated):
Calories: 372Total Fat: 17gSaturated Fat: 10gTrans Fat: 0gUnsaturated Fat: 6gCholesterol: 55mgSodium: 105mgCarbohydrates: 54gFiber: 2gSugar: 38gProtein: 3g
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