There are some desserts that instantly transport you back to childhood, and Cosmic Brownies are one of them. One bite of that rich chocolate brownie topped with silky frosting and colorful candy-coated chips can bring back memories of lunchboxes, after-school snacks, and special treats from the grocery store.
The best part is that making them at home is even better. Homemade Cosmic Brownies have the same iconic look you remember but with a richer chocolate flavor, a softer, fudgier texture, and a thick layer of glossy chocolate ganache that melts in your mouth.
Unlike boxed brownies, this recipe stays wonderfully moist without becoming cakey. Every square is dense, chewy, and packed with deep cocoa flavor.
The colorful candy-coated chocolate chips on top add the perfect little crunch and instantly make these brownies recognizable.
They’re ideal for birthday parties, bake sales, school lunches, holiday dessert trays, or simply satisfying a chocolate craving.
You don’t need fancy equipment or complicated techniques.
Everything comes together with simple pantry ingredients.
The batter mixes in just minutes.
After baking, all that’s left is spreading on the rich ganache and sprinkling on the colorful candies.
Once chilled, they slice beautifully into perfect bakery-style squares.
If you loved Cosmic Brownies as a kid, this homemade version is about to become your new favorite chocolate dessert.
Why You’ll Love This Recipe
These brownies capture everything people love about the classic snack while improving every part of it. They’re extra fudgy, intensely chocolatey, and topped with a smooth chocolate ganache that stays soft instead of becoming hard. Every bite delivers rich cocoa flavor balanced by the fun crunch of colorful candy-coated chocolate chips.
Because they’re homemade, you can control the quality of the ingredients while enjoying a fresher, richer dessert than anything from the store. They also keep well, making them perfect for preparing ahead of time.
Ingredients
For the Brownies
- 1 cup unsalted butter, melted
- 1½ cups granulated sugar
- 1 cup light brown sugar
- 4 large eggs
- 2 teaspoons vanilla extract
- 1 cup unsweetened cocoa powder
- 1 cup all-purpose flour
- ½ teaspoon salt
- 2 tablespoons cornstarch
For the Chocolate Ganache
- 1 cup semi-sweet chocolate chips
- ½ cup heavy cream
- 2 tablespoons butter
Topping
- ½ cup rainbow candy-coated chocolate chips (or mini rainbow chocolate candies)
How to Make Homemade Cosmic Brownies
Step 1
Preheat your oven to 325°F. Line a 9×13-inch baking pan with parchment paper, leaving extra hanging over the sides for easy removal.
Step 2
Whisk together the melted butter, granulated sugar, and brown sugar until smooth.
Step 3
Add the eggs one at a time, whisking well after each addition. Stir in the vanilla extract.
Step 4
Sift together the cocoa powder, flour, cornstarch, and salt. Fold the dry ingredients into the wet ingredients until just combined. Do not overmix.
Step 5
Spread the thick batter evenly into the prepared baking pan.
Step 6
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