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A close-up of chocolate homemade cosmic brownies topped with colorful round sprinkles. The brownies are cut into square pieces and arranged on parchment paper. The focus is on the front piece, with more brownies visible in the background.
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5 from 1 vote

Homemade Cosmic Brownies

Easy-to-make homemade cosmic brownies are rich and fudgy, a classic old fashioned brownie with frosting.
Prep Time10 minutes
Cook Time30 minutes
Additional Time30 minutes
Total Time1 hour 10 minutes
Servings: 24 brownies
Calories: 260kcal
Author: Melissa Griffiths

Equipment

Ingredients 

Cosmic Brownies

  • 4 squares 1 ounce each unsweetened chocolate, 4 ounces total
  • ⅔ cup butter
  • 2 cups sugar
  • 4 eggs
  • 2 teaspoons vanilla
  • 1 ¼ cups all purpose flour
  • 1 teaspoon baking powder
  • 1 teaspoon salt
  • 1 cup chopped nuts if desired

Glossy Chocolate Frosting

  • 3 squares 1 ounce each unsweetened chocolate
  • 3 tablespoons butter
  • 2 cups powdered sugar
  • ¼ teaspoon salt
  • ⅓ cup milk
  • 2 teaspoons vanilla
  • ½ cup finely chopped nuts if desired

Instructions

  • Preheat oven to 350°. Grease 13x9x2 inch baking pan or line with foil or parchment.
  • Add 4 squares chocolate and ⅔ cup butter to a large saucepan and cook over low heat until melted, stirring frequently. Remove from heat.
  • Add sugar, eggs, and vanilla and whisk until well blended. Stir in flour, baking powder, salt, and nuts if using, and mix just until blended. Spread into prepared pan. 
  • Bake for about 30 minutes, or until brownies begin to pull away from the sides of the pan. (Do not overbake.)
  • Cool slightly; spread with Glossy Chocolate Frosting. Cool completely before serving.

  • Glossy Chocolate Frosting
  • Add 3 squares chocolate and 3 tablespoons butter to a large saucepan and cook over low heat until melted.
  • Stir in powdered sugar, milk, salt, and vanilla. Whisk until smooth.
  • Place pan of frosting in bowl of ice and water; continue beating until smooth, creamy, and of spreading consistency. Stir in nuts if using.
  • Frost the brownies and top with sprinkles if using. Slice brownies and serve!

Notes

  • Letting eggs come to room temperature will help them incorporate more smoothly into the chocolate mixture.
  • Don't overbake! The brownies should still be slightly fudgy when tested with a toothpick.
  • Allow the brownies to cool completely before frosting for the best results.
  • Store in an airtight container at room temperature for up to 5 days.

Nutrition

Serving: 1g | Calories: 260kcal | Carbohydrates: 34g | Protein: 4g | Fat: 13g | Saturated Fat: 6g | Polyunsaturated Fat: 6g | Cholesterol: 49mg | Sodium: 133mg | Fiber: 1g | Sugar: 27g