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Cosmic brownie on a weathered wooden back drop with a glass of cold milk
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4.34 from 3 votes

Copy Cat Little Debbie Cosmic Brownies

An easy, made from scratch recipe this cosmic brownie recipe is a spot on copy cat of your favorite store bought snack cake. Fudge-y, brownie like bars are topped with a smooth layer of chocolate ganache and topped with coated candies.
Prep Time15 mins
Cook Time30 mins
Total Time45 mins
Course: Dessert, Snack
Cuisine: American
Servings: 12
Calories: 519kcal


For the Brownies

  • 3/4 cup butter 1½ Sticks
  • 2 eggs
  • 1 cup sugar
  • 2/3 packed cup light brown sugar
  • 2 tbsp milk
  • 2 tsp vanilla extract
  • 3/4 cup unsweetened cocoa powder
  • 3/4 cup all-purpose flour

For the chocolate ganache topping:

  • 1 1/2 cups semi sweet chocolate chips
  • 1/2 cup heavy cream
  • 1 cup M&M minis or rainbow chocolate chip candies


  • Line an 11×7 inch pan with foil. Spray with non stick spray.
  • In a large bowl, melt butter in the microwave for 1-2 minutes, or melt in a small pot over low heat and then transfer to the bowl.
  • Whisk in the sugars, eggs, milk, and vanilla. Then whisk in the cocoa powder until the batter is smooth and not lumpy.
  • Add flour gradually, stirring until everything’s evenly combined.
  • Pour the batter out into the prepared pan, and use a spatula to gently spread it out evenly. Bake at 350 degrees for 25-30 minutes or until a toothpick inserted in the center comes out clean. Allow it to cool completely.
  • Heat the heavy cream in a medium sauce pan over medium-medium low heat. Add in the chocolate chips, stirring occasionally until they’ve both completely incorporated and the ganache is smooth.
  • Pour the ganache over the completely cooled brownies. Smooth it out with an offset spatula.
  • Sprinkle the M&Ms, or rainbow chocolate chip candies, over the top of the ganache. Refrigerate until the ganache has set. Cut brownies into squares to serve and enjoy!


Calories: 519kcal | Carbohydrates: 62g | Protein: 5g | Fat: 29g | Saturated Fat: 18g | Cholesterol: 76mg | Sodium: 136mg | Potassium: 258mg | Fiber: 4g | Sugar: 48g | Vitamin A: 590IU | Vitamin C: 1mg | Calcium: 69mg | Iron: 3mg