Cosmic Brownie Bars (Copycat Recipe)

Cosmic Brownie Bars are rich, fudgy, chocolate-laden treats that deliver pure nostalgia in every bite. Known for their dense texture, glossy ganache topping, and colorful candy-coated chocolate sprinkles, these brownies were a staple in lunchboxes throughout the ’90s and early 2000s. The copycat version captures everything you love about the original Little Debbie classic—without preservatives or artificial additives—while allowing for customization and a homemade touch. This recipe replicates the signature chewy bite, deep cocoa flavor, and smooth frosting of the original, all while being made from scratch in your own kitchen. Whether you’re recreating childhood memories or introducing a new generation to this beloved dessert, Cosmic Brownie Bars offer a perfect combination of indulgence and playfulness.

The History of Cosmic Brownies

Cosmic Brownies were first introduced by Little Debbie in 1999, quickly becoming one of the most recognizable packaged snacks on the market. Named after the “cosmic” theme that was popular with children at the time, the brownies were a reimagining of traditional fudge brownies, enhanced with a thick layer of chocolate frosting and topped with rainbow-colored candy-coated chocolate chips. The cosmic aesthetic appealed to kids, while the soft, chewy texture and chocolaty richness kept them coming back for more. The snack’s popularity has endured for over two decades, thanks to its unique combination of flavor and visual appeal. As adults grew nostalgic for the treats of their youth, home bakers began developing copycat recipes to replicate the iconic brownie using pantry staples and simple techniques, making it possible to enjoy the beloved dessert anytime, anywhere, without needing to grab a pre-packaged box.

Ingredients Breakdown

1. Unsalted Butter: Used as the base of the brownie batter, butter adds richness and contributes to the dense, fudgy texture.
2. Granulated Sugar: Provides sweetness and helps create a soft, chewy crumb by caramelizing slightly as it bakes.
3. Brown Sugar: Adds a touch of molasses flavor and enhances moisture, contributing to the iconic chewy texture.
4. Eggs: Bind the ingredients together and provide structure to the brownies while helping create a dense, fudgy interior.
5. Vanilla Extract: Adds depth of flavor and balances the intense chocolate taste.
6. All-Purpose Flour: Gives structure to the brownies without making them too cakey.
7. Unsweetened Cocoa Powder: Responsible for the deep chocolate flavor; Dutch-processed cocoa creates a richer, darker result.
8. Salt: Enhances the overall flavor and balances the sweetness.
9. Semi-Sweet Chocolate Chips or Chopped Chocolate: Melted into the batter or folded in, this boosts the chocolate intensity.
10. Heavy Cream: Combined with chocolate to make the smooth ganache topping.
11. Chocolate Chips for Ganache: Typically semi-sweet or dark, melted with cream to form a glossy, fudgy topping.
12. Rainbow Candy-Coated Chocolate Chips: These colorful candies replicate the classic look of Cosmic Brownies, adding crunch and visual appeal.

Step-by-Step Recipe

1. Preheat Oven and Prepare Pan: Preheat your oven to 350°F (175°C) and line an 8×8-inch baking pan with parchment paper, leaving a bit of overhang for easy removal.
2. Make the Brownie Batter: In a saucepan, melt the butter over medium heat. Remove from heat and whisk in the granulated sugar and brown sugar until smooth. Allow it to cool slightly, then whisk in the eggs and vanilla extract.
3. Add Dry Ingredients: Sift together the flour, cocoa powder, and salt. Gently fold the dry mixture into the wet ingredients using a rubber spatula until just combined. Do not overmix.
4. Optional Chocolate Boost: Fold in some melted semi-sweet chocolate or chocolate chips for an extra fudgy texture.
5. Bake: Pour the batter into the prepared pan and smooth the top. Bake for 20–25 minutes, or until a toothpick inserted comes out with moist crumbs. Do not overbake. Let the brownies cool completely in the pan.
6. Prepare Ganache: While the brownies are cooling, heat the heavy cream in a saucepan or microwave until just simmering. Pour the hot cream over the chocolate chips in a bowl. Let it sit for a minute, then stir until smooth and glossy.
7. Frost the Brownies: Once the brownies are cool, pour the ganache over the top and spread evenly with an offset spatula.
8. Add Toppings: Immediately sprinkle the rainbow candy-coated chocolate chips over the ganache while it’s still soft. Gently press them down to ensure they stick.
9. Chill and Slice: Refrigerate the brownies for at least 1 hour to set the ganache before slicing into squares or rectangles.

Tips for the Perfect Cosmic Brownie Bars

Use high-quality cocoa powder and chocolate for the richest flavor. Be sure not to overmix the batter once the flour is added—this helps avoid a cakey texture. Let the brownies cool fully before adding the ganache to prevent it from melting into the base. Chill the finished brownies before slicing to get clean, sharp edges. For that classic look, slice them into rectangular bars rather than squares. If you want softer brownies, slightly underbake them and allow residual heat to finish the cooking. Use parchment paper for easy lifting and cutting. Add a pinch of espresso powder to the batter to enhance the chocolate flavor even more. Store leftovers in the fridge to keep the ganache firm and glossy, but let them sit at room temperature for a few minutes before eating for the best texture.

Variations and Customizations

Use dark chocolate ganache for a more intense flavor or milk chocolate for a sweeter, more classic taste. Replace the rainbow candies with mini M&Ms, chocolate chips, or sprinkles for a different aesthetic. Add chopped nuts like walnuts or pecans to the brownie base for a crunchy contrast. Swirl peanut butter or Nutella into the batter before baking for a rich flavor twist. Make a gluten-free version by substituting a 1:1 gluten-free flour blend. For a dairy-free option, use plant-based butter and cream alternatives, and make sure your chocolate is dairy-free. Add a caramel drizzle or crushed pretzels on top for a sweet-salty combo. For a festive touch, use holiday-themed sprinkles or candy on top of the ganache. Make brownie bites in mini muffin tins for a party-ready, portion-controlled version.

Health Considerations and Nutritional Value

Cosmic Brownie Bars are an indulgent dessert high in sugar, fat, and calories, so portion control is key. Each serving provides a rich dose of carbohydrates and saturated fat, mostly from the butter, cream, and chocolate. While not a health food, they can be enjoyed in moderation as part of a balanced diet. To lighten the recipe, you can reduce the sugar slightly, use low-fat cream or Greek yogurt in the ganache, and cut back on the ganache thickness. Using dark chocolate with a higher cocoa content provides some antioxidants and less sugar. If making these for children or people with dietary restrictions, opt for natural food coloring and allergen-free candy toppings. Overall, this is a treat meant to be savored occasionally and celebrated for its nostalgic, comforting qualities rather than its nutritional profile.

Frequently Asked Questions (FAQ)

Can I use a boxed brownie mix? Yes, but the texture may differ slightly from the original Cosmic Brownies. Make sure it’s a fudgy mix and not a cakey one.
How do I store them? Store in an airtight container in the fridge for up to 5 days. Let them come to room temperature before serving for the best texture.
Can I freeze them? Yes, wrap them tightly in plastic wrap and freeze for up to 2 months. Thaw in the fridge overnight before serving.
What kind of chocolate is best for ganache? Semi-sweet chocolate chips or chopped chocolate bars work best for the right balance of sweetness and richness.
Can I make this dairy-free? Yes, use plant-based butter and cream, and ensure your chocolate is dairy-free.
Why is my ganache grainy? It may have been overheated or not stirred properly. Be sure to pour hot cream over the chocolate and let it sit for a minute before stirring.
Do I have to use candy sprinkles? No, the sprinkles are for decoration. You can skip them or replace them with other toppings like nuts or fruit pieces.
Why are my brownies cakey instead of fudgy? Overbaking or overmixing can lead to cakey brownies. Bake until just set and avoid over-stirring the batter.
Can I double the recipe? Yes, bake in a 9×13-inch pan and adjust baking time as needed.
Are these safe for nut allergies? The base recipe is nut-free, but always check your chocolate and candies for cross-contamination warnings.

Cosmic Brownie Bars (Copycat Recipe)

Homemade Cosmic Brownie Bars are a rich, chewy, chocolate-packed dessert topped with creamy ganache and colorful candy bits, perfectly replicating the beloved childhood treat. With simple ingredients and easy steps, this copycat recipe brings nostalgia and indulgence together in every bite.

Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 25 minutes mins

Total Time 1 hour hr 40 minutes mins

Servings 16

Ingredients

  

For the brownies:

• 10 tablespoons 142 grams unsalted butter
• 1 cup 200 grams granulated sugar
• 1/3 cup 67 grams packed light brown sugar
• 3/4 cup plus 2 tablespoons 88 grams unsweetened cocoa powder, sifted
• 1/2 teaspoon vanilla extract
• 2 large eggs and 1 egg yolk
• 1 tablespoon corn syrup
• 2/3 cup 85 grams all-purpose flour
• 1 tablespoon cornstarch
• 1/4 teaspoon salt

For the frosting:

• 1/2 cup heavy cream
• 1 1/2 cups 255 grams semisweet chocolate chips
• Rainbow candy-coated chocolate chips mini M&Ms, sprinkles, or other candy for topping

Instructions

 

Make the brownies:

• Preheat your oven to 350°F (175°C). Line an 8×8-inch metal baking pan with parchment paper or foil, and lightly spray with cooking spray.
• In a large microwave-safe bowl, melt the butter in the microwave for about 90 seconds on high power. Stir in the granulated sugar, brown sugar, and sifted cocoa powder. If the mixture is still very hot, allow it to cool slightly before adding the vanilla extract, eggs, egg yolk, and corn syrup. Stir until fully combined. Add the flour, cornstarch, and salt, and stir until just incorporated—the batter will be thick. Pour the batter into the prepared pan and bake for 25 minutes. Let the brownies cool completely in the pan.

Make the frosting:

• In a small microwave-safe bowl, heat the heavy cream on high for about 1 minute. Add the chocolate chips and let the mixture sit for 3 minutes. Stir until smooth and fully combined. Pour the frosting over the cooled brownies and spread evenly. Sprinkle with rainbow candy-coated chocolate chips. Refrigerate the brownies for 1 to 2 hours, or until the frosting has set before slicing.
• Brownies can be stored in an airtight container for up to 3 days at room temperature and for up to 1 week in the refrigerator. They are best served chilled.