This Cosmic Brownies Recipe produces thick, fudgy brownies finished with a glossy chocolate ganache and colorful rainbow candies for a bit of crunch and nostalgia.
Author’s Notes
A Childhood Favorite, Made Even Better!
As a child, Cosmic Brownies were the ultimate treat. I’ve always loved chocolate and brownies, and the combination of a dense fudgy base topped with chocolate and tiny rainbow candies is timeless. They felt special because my mom didn’t buy them often.
These homemade Cosmic Brownies capture that nostalgia but improve on the original with real chocolate, a simple ganache, and quality ingredients. The result is dense, deeply chocolatey bars with melty pockets of chocolate inside and a smooth, shiny topping finished with rainbow chips or mini candies.
Ingredients In This Cosmic Brownies Recipe
| Ingredient | Notes |
|---|---|
| Butter & sugars | Use melted butter for a dense, fudgy texture. Brown sugar adds moisture and depth—use fresh, soft brown sugar. |
| Eggs & vanilla | Beat until smooth for a glossy, crackly top. Room-temperature eggs give the best texture. |
| Flour, cocoa powder & salt | Choose Dutch-process cocoa for a deeper chocolate flavor. Spoon and level the flour to avoid dry brownies. |
| Chocolate chips (in batter & topping) | Divide the chips so you get melty pockets inside and extra chocolate on top. |
| Heavy cream & rainbow candy chips | Warm cream fully for a smooth ganache. Add candies immediately after spreading so they adhere to the topping. |
How To Make My Cosmic Brownies Recipe
- Prep pan & oven: Preheat oven to 350°F (175°C). Grease and line an 8 x 8-inch pan with parchment, leaving an overhang to lift the brownies out easily.
- Mix wet ingredients: Whisk melted butter with granulated and brown sugar until smooth. Add eggs and vanilla, whisking until creamy and glossy.
- Add dry ingredients: Add the flour, Dutch-process cocoa powder, and salt. Switch to a wooden spoon and stir until just combined. Fold in about half the mini chocolate chips.
- Fill pan: Spread the batter evenly in the prepared pan, then sprinkle the remaining chocolate chips on top.
- Bake: Bake 25–30 minutes, until the edges are set and the center still looks slightly underdone. Do not overbake—centers should remain soft and fudgy.
- Cool & make ganache: Let the brownies cool completely. For the ganache, place semi-sweet chocolate chips in a heat-safe bowl. Warm the heavy cream until near boiling, pour it over the chips, cover for 4 minutes, then stir until smooth. If needed, heat in short bursts until glossy.
- Top & set: Spread the ganache over the cooled brownies and immediately scatter rainbow candy chips or sprinkles on top so they stick. Refrigerate 1–2 hours until the topping is set.
- Serve: Lift the brownies from the pan using the parchment overhang. Cut with a sharp knife, wiping it clean between cuts, and serve chilled or at room temperature.
Chelsea’s Top Tip
Don’t Over-Bake
Remove the brownies when the center still looks a touch underdone. They will finish setting as they cool, keeping the texture fudgy rather than dry. Using a light-colored, shiny pan helps them bake more evenly.
Storage
Store leftover brownies in an airtight container at room temperature up to 4 days. Keep them in a single layer or separate layers with parchment to protect the topping. Freeze individual squares wrapped tightly for up to 3 months; thaw at room temperature.
More Nostalgic Favorites
Desserts
Lunch Lady Bars
Desserts
Carmelitas (My Favorite Dessert!)
Salads
Orange Fluff Salad
Desserts
Bread Pudding Recipe
Cosmic Brownies Recipe
Equipment
-
8 x 8-inch light-colored baking pan
Ingredients
- Cooking spray
- 11 tablespoons unsalted butter melted and cooled
- 1 cup granulated sugar
- 1/2 cup light brown sugar lightly packed
- 2 large eggs
- 2 teaspoons vanilla extract
- 2/3 cup all-purpose flour
- 2/3 cup Dutch-process cocoa powder see note
- 1/4 teaspoon salt
- 3/4 cup mini chocolate chips divided
- 3/4 cup semi-sweet chocolate chips
- 1/4 cup heavy cream
- Rainbow candy chips or sprinklesfor topping
Instructions
-
Preheat oven to 350°F. Grease an 8 x 8-inch metal pan and line with parchment paper, leaving an overhang for easy removal. Avoid foil or wax paper.
-
Whisk melted butter, granulated sugar, and brown sugar in a large bowl until smooth. Add eggs and vanilla and whisk until creamy.
-
Add flour, cocoa powder, and salt. Switch to a wooden spoon and stir until just combined. Stir in 1/2 cup mini chocolate chips. Do not overmix.
-
Scrape the batter into the prepared pan and smooth the top. Sprinkle the remaining 1/4 cup chocolate chips across the surface.
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Bake 25–30 minutes, until just set to the touch. Centers should remain soft and fudgy. Let brownies cool completely before adding the topping.
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Place chocolate chips in a heat-safe bowl. Heat the cream until it just begins to simmer, pour it over the chocolate, cover for 4 minutes, then stir until smooth. If needed, microwave in 15-second bursts, stirring until glossy.
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Pour the ganache over the cooled brownies and spread evenly. Immediately sprinkle rainbow chips or sprinkles on top so they adhere.
-
Refrigerate 1–2 hours until the topping is set. Lift the brownies out using the parchment overhang, cut with a sharp knife (wiping between cuts), and serve chilled or at room temperature.
Recipe Notes
Pan tip: Baking time can vary with dark or glass pans. Light-colored, shiny pans bake most evenly.
Storage: Store in an airtight container up to 4 days at room temperature or up to 1 week refrigerated. Freeze individually wrapped brownies for up to 3 months.
Nutrition
Nutrition information is an estimate and should be used as an approximation only.