These Cosmic Brownies are a faithful, elevated remake of the childhood favorite. This copycat recipe recreates the nostalgic flavors while refining the texture and presentation for adult tastebuds.
These brownies differ slightly from a typical brownie because they’re finished with a silky ganache rather than a crackly sugar top. The brownie base is soft and pillowy so it melds with the ganache for a melt-in-your-mouth experience. If you prefer a smaller batch, there’s also a small-batch version available.
The ganache in this recipe is balanced and exceptionally smooth — not overly rich or grainy. Spread over the brownie base it forms a glossy, fudgy layer with an almost cloud-like texture. Colorful candy-coated chocolate chips on top add visual appeal, a pleasant crunch, and nostalgic charm.
If you enjoy brownie recipes, you might also like some of the smaller batch treats that focus on the same fudgy texture and straightforward ingredients.
Ingredients for this Copycat Cosmic Brownies Recipe
Below are the ingredient groups used to build these homemade cosmic brownies. Exact measurements and the full method are shown in the recipe card at the end.
Brownie Base
- Unsalted Butter: provides moist crumbs and a classic fudgy texture.
- Granulated Sugar and Brown Sugar: balance sweetness and contribute to texture.
- Dutch-Process Cocoa Powder: delivers an intense chocolate flavor and deep color similar to the original snack cake.
- Salt: enhances the chocolate flavor.
- Vanilla Extract: rounds out and strengthens the chocolate notes.
- Large Eggs: bind ingredients and create richness; use at room temperature.
- All-Purpose Flour: gives the brownies structure.
- Cornstarch: helps achieve a tender, chewy crumb by limiting gluten development.
Rich Chocolate Ganache Topping
- Heavy Cream: melts the chocolate and yields a glossy ganache.
- Semisweet Chocolate Bar: chopped and melted with cream to create a smooth, spreadable topping; use good quality chocolate for best results.
- Pinch of Salt: balances sweetness and deepens chocolate flavor.
- Candy-Coated Rainbow Chocolate Chips: the signature colorful topping for texture and nostalgia.
How to make this Homemade Cosmic Brownies Recipe
Here’s an overview of the method. Scroll to the recipe card for oven temperature, precise times, and the full step-by-step instructions.
- Preheat the oven and line an 8×8-inch pan with parchment, leaving an overhang for easy removal.
- Melt the butter in a medium saucepan. Stir in granulated sugar, brown sugar, cocoa powder, and salt until smooth and combined.
- Transfer the chocolate mixture to a large bowl, whisk in vanilla, then add eggs one at a time, beating until the batter is thick and glossy.
- Fold in the flour and cornstarch until just combined; avoid overmixing.
- Pour batter into the prepared pan, smooth the top, and bake until the edges are set and the center still jiggles slightly. Cool completely in the pan.
- When cooled, flip the brownies out and remove parchment so the top is flat and ready for the ganache.
- Warm heavy cream until hot but not boiling, then pour over chopped semisweet chocolate. Let sit for a minute.
- Add a pinch of salt and stir until the ganache is smooth and glossy.
- Spread the ganache over the cooled brownies using an offset spatula for an even layer.
- While ganache is still soft, scatter the rainbow candy chips across the top.
- Chill until the ganache sets. For clean slices, use a sharp knife and wipe it between cuts.
Tips and Tricks for the Best Flavor
- Use high-quality chocolate for the ganache — it noticeably improves flavor and texture.
- Choose Dutch-process cocoa for a deeper chocolate flavor and darker color.
- Don’t skip the cornstarch: it helps give the brownies the tender-chewy texture that defines this recipe.
- Use room-temperature eggs so they incorporate smoothly into the batter.
- Avoid overbaking. Remove the pan when the edges are set but the center still has a slight jiggle; the brownies will finish as they cool.
- For greater accuracy, weigh ingredients with a kitchen scale, especially the flour.
Why you should make these fudgy Cosmic Brownies
- They evoke childhood memories while offering a refined, homemade flavor.
- The recipe uses simple, easy-to-find ingredients from any grocery store.
- Many find this homemade version even more satisfying than the store-bought snack.
- This treat is likely to become a favorite for both kids and adults.
Frequently Asked Questions – FAQ
Can I add flavor variations?
- Add 1–2 tablespoons instant espresso powder for a mocha note.
- Swap semisweet chocolate for dark chocolate in the ganache for a less sweet, more intense finish.
- Stir in a teaspoon of cinnamon or a handful of peanut butter chips for a twist.
- Combine other toppings with the rainbow chips for variety.
Can I use regular cocoa instead of Dutch-process?
You can, but Dutch-process cocoa gives a deeper flavor and darker color that more closely matches the classic cosmic brownie profile.
Can I make these ahead of time?
Yes. The brownies store well in the refrigerator for a couple of days in an airtight container.
How should I store leftovers?
Keep leftovers in an airtight container in the fridge for 3–4 days for the best texture and freshness.
Can I freeze them?
Yes. Wrap individual slices tightly in plastic wrap, then store in an airtight container or zip-top bag. They keep well for one to two months.
Can I make a gluten-free version?
Use a trusted gluten-free flour blend to adapt the recipe. Note that texture may differ slightly from the original.
Can I use chocolate chips instead of a chopped chocolate bar for the ganache?
A chopped chocolate bar melts and spreads more evenly because chips often contain stabilizers designed to hold their shape. Using a bar yields a smoother ganache texture.
Gourmet Cosmic Brownies Recipe
Ingredients
Brownie Base
- ½ cup unsalted butter
- ¾ cup granulated sugar
- ¼ cup brown sugar
- ½ cup Dutch-process cocoa powder
- ¼ tsp salt
- 1 tsp vanilla extract
- 2 large eggs room temperature
- ½ cup all-purpose flour
- 1 tbsp cornstarch
Ganache Topping
- 1/4 cup heavy cream
- 4 oz semisweet chocolate chopped
- Pinch of salt
Topping
- 2–3 tbsp rainbow candy-coated chocolate chips Wilton rainbow chips or similar
Instructions
Make the Brownies
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Preheat oven to 350°F. Line an 8×8 pan with parchment paper.
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In a medium saucepan, melt the butter on the stove. Once melted stir in the granulated sugar, brown sugar, cocoa powder, and salt until the mixture is well blended and smooth.
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Transfer to a large bowl, whisk in vanilla, then add eggs one at a time, beating until the batter is thick and shiny.
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Fold in flour and cornstarch until just combined.
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Spread into the pan and bake for 20-22 minutes, or until the edges are set and the center has a slight jiggle. Let cool completely.
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Once cool, flip the brownies and remove the parchment paper. To get an even flat surface, add the chocolate ganache to the top for a clean finish.
Make Ganache
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Heat cream for about 30 seconds. Pour over chopped chocolate and let sit 1 minute. Add a pinch of salt and stir until smooth. Spread ganache over the cooled brownie.
Add Rainbow Chips + Chill
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Sprinkle candy chips on top while ganache is still soft.
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Chill for 1–2 hours before slicing. Wipe knife between cuts for clean edges.
Notes
Nutrition
Nutrition information is automatically calculated and should be used as an approximation.