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Finished cosmic brownies in an 8-inch square pan with glossy chocolate topping, rainbow candy chips, and neatly cut bars viewed from above.

Cosmic Brownies

Cosmic Brownies
These Cosmic Brownies are rich, dense, and deeply chocolatey with a chewy brownie base, a soft chocolate topping, and colorful candy-coated chips. They are designed to deliver a nostalgic snack-bar feel with a more polished homemade flavor and texture.
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Prep Time 20 minutes
Cook Time 30 minutes
Resting/Cooling Time 1 hour
Total Time 1 hour 50 minutes
Servings: 16 Brownies
Course: Brownies
Cuisine: American
Ingredients Equipment Method Notes

Ingredients
  

  • 3/4 cup unsalted butter
  • 4 ounces bittersweet chocolate chopped
  • 1 cup granulated sugar
  • 1/2 cup packed light brown sugar
  • 2 large eggs
  • 1 large egg yolk
  • 1 teaspoon vanilla extract
  • 1/3 cup unsweetened cocoa powder
  • 3/4 cup all-purpose flour
  • 2 tablespoons cornstarch
  • 1/2 teaspoon fine salt
  • 2 tablespoons whole milk
  • For the topping:
  • 3/4 cup semisweet chocolate chips
  • 1/3 cup heavy cream
  • 1 tablespoon unsalted butter
  • 3 to 4 tablespoons rainbow candy-coated chips or rainbow chip crunch

Equipment

  • 8-inch square baking pan
  • Parchment paper
  • Small saucepan
  • Large mixing bowl
  • Whisk
  • Silicone spatula
  • Offset spatula or spoon for smoothing
  • Cooling rack
  • Sharp chef’s knife for slicing

Method
 

  1. Preheat the oven to 350 degrees Fahrenheit and line an 8-inch square baking pan with parchment, leaving overhang to lift the brownies out later.
  2. Melt the butter and chopped chocolate together in a small saucepan over low heat, stirring until smooth.
  3. Remove from the heat and whisk in the granulated sugar, brown sugar, and cocoa powder until thick and glossy.
  4. Add the eggs and egg yolk one at a time, whisking well after each addition, then whisk in the vanilla and milk.
  5. Fold in the flour, cornstarch, and salt just until no dry patches remain.
  6. Spread the batter evenly into the prepared pan and smooth the top.
  7. Bake for 24 to 30 minutes, until the edges are set and a tester in the center comes out with moist crumbs.
  8. Cool the brownie slab completely in the pan.
  9. For the topping, heat the heavy cream and butter until steaming, then pour over the chocolate chips. Let sit for 2 to 3 minutes, then stir until smooth.
  10. Spread the topping evenly over the cooled brownies and let it sit for 10 to 15 minutes.
  11. Sprinkle the rainbow chips evenly over the top and chill the pan for about 20 minutes to set the topping.
  12. Lift the slab from the pan and cut into bars with a warm, clean knife.

Notes

  • Do not overbake the brownies if you want the final texture to stay dense and chewy.
  • The center should still give moist crumbs on a tester for the best fudgy result.
  • Whisking the sugars into the warm chocolate mixture helps create a glossy top.
  • Fold the flour mixture in gently to avoid developing too much gluten.
  • Cornstarch helps soften the crumb and supports the snack-cake style texture.
  • Cool the brownie base fully before adding the topping or the layers may slide.
  • Let the topping sit briefly before adding the candy chips so the colors stay bright.
  • Use parchment overhang for easy lifting and cleaner slicing.
  • Warm and wipe the knife between cuts for neat edges.
  • Store in an airtight container to keep the bars soft and moist.
  • Refrigeration gives a firmer texture and cleaner slices.
  • Frozen bars should be wrapped well to protect the topping and prevent drying out.
  • Mini candy-coated chocolates can work if rainbow chip crunch is unavailable, but the look may vary slightly.
  • Measure flour lightly so the brownies do not bake up dry or heavy.
  • Room temperature eggs help the batter emulsify more smoothly.
Nutrition Information Per serving
  • Calories: 235
  • Carbohydrates: 28 g
  • Protein: 3 g
  • Fat: 13 g
  • Saturated Fat: 8 g
  • Sugar: 21 g
  • Fiber: 2 g
  • Sodium: 95 mg
  • Cholesterol: 52 mg