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Best Homemade Fudgy Copycat Cosmic Brownies

A close-up of a fudgy cosmic brownie square topped with shiny chocolate glaze and colorful candy-coated chocolates.

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Make the best homemade cosmic brownies that taste better than store-bought. These are ultra fudgy, dense, and topped with a smooth chocolate ganache and colorful candy chips for a nostalgic, decadent chocolate dessert.

Ingredients

Scale
  • 1/2 cup unsalted butter
  • 1 cup granulated sugar
  • 1/2 cup packed light brown sugar
  • 2 large eggs
  • 1 teaspoon vanilla extract
  • 3/4 cup all-purpose flour
  • 1/2 cup unsweetened cocoa powder
  • 1/4 teaspoon salt
  • 1/4 teaspoon baking powder
  • 1/2 cup semi-sweet chocolate chips
  • 1/2 cup chocolate ganache frosting (recipe below)
  • 1/4 cup colorful candy-coated chocolate chips (for topping)
  • For the Chocolate Ganache Frosting:
  • 1 cup semi-sweet chocolate chips
  • 1/2 cup heavy cream
  • 1 tablespoon unsalted butter

Instructions

  1. Preheat your oven to 350°F (175°C). Line an 8×8 inch baking pan with parchment paper, leaving an overhang for easy removal. Lightly grease the paper.
  2. In a medium saucepan over low heat, melt the 1/2 cup of butter. Remove from heat.
  3. Whisk the granulated sugar and brown sugar into the melted butter until combined.
  4. Whisk in the eggs one at a time, mixing well after each addition. Stir in the vanilla extract.
  5. In a separate bowl, whisk together the flour, cocoa powder, salt, and baking powder.
  6. Gradually add the dry ingredients to the wet ingredients, mixing only until just combined. Do not overmix.
  7. Fold in the 1/2 cup of semi-sweet chocolate chips.
  8. Spread the batter evenly into the prepared pan.
  9. Bake for 25 to 30 minutes. A toothpick inserted near the center should come out with moist crumbs attached, not wet batter. This ensures a fudgy texture.
  10. Let the brownies cool completely in the pan on a wire rack.
  11. Prepare the ganache: Place 1 cup of chocolate chips in a heatproof bowl. Heat the heavy cream and 1 tablespoon of butter in a small saucepan until simmering. Pour the hot cream mixture over the chocolate chips. Let it sit for 5 minutes, then whisk until smooth and glossy.
  12. Pour the warm ganache over the cooled brownies and spread evenly.
  13. Immediately sprinkle the colorful candy-coated chocolate chips over the wet ganache.
  14. Allow the ganache to set completely at room temperature or chill briefly before lifting the brownies out using the parchment overhang and cutting them into squares.

Notes

  • For the fudgiest results, slightly underbake the brownies by about 2 minutes.
  • If you cannot find pre-made colorful candy-coated chips, you can use standard rainbow sprinkles or melt colored candy wafers and drizzle them on top.
  • Store leftover brownies tightly covered at room temperature for up to 4 days for best texture.

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