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Fudgy Cosmic Brownie Cookies

Decadent chocolate cookies that blend classic brownie nostalgia with portable convenience, enriched with colorful candy-coated chocolate chips.
Prep Time15 minutes
Cook Time11 minutes
Total Time26 minutes
Course: Dessert, Snack
Cuisine: American
Keyword: Brownie Cookies, Chocolate Cookies, Cosmic Brownies, Fudgy Cookies, Sweet Treats
Servings: 12 cookies
Calories: 175kcal

Ingredients

For the Cookies

  • 1/2 cup unsalted butter, melted Use 1 stick of butter
  • 2/3 cup brown sugar
  • 1/3 cup granulated sugar
  • 1 large egg
  • 1 tsp vanilla extract
  • 1/2 cup unsweetened cocoa powder
  • 3/4 cup all-purpose flour
  • 1/4 tsp baking soda
  • 1/4 tsp salt
  • 1/2 cup semi-sweet chocolate chips Optional for extra fudginess

For the Ganache Topping

  • 1/2 cup semi-sweet chocolate chips
  • 1/4 cup heavy cream
  • Pinch of salt

Topping

  • Rainbow candy-coated chocolate chips Like mini M&Ms or rainbow sprinkles

Instructions

Preparation

  • Preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper.
  • In a bowl, whisk together melted butter and both sugars until well combined.
  • Add the egg and vanilla extract, mixing until smooth and creamy.
  • Stir in the cocoa powder, gradually incorporating the flour, baking soda, and salt until fully blended.
  • Fold in the chocolate chips to create a thick and glossy cookie dough.
  • Using a cookie scoop (about 2 tablespoons each), drop balls of dough onto the prepared baking sheet, spaced apart.
  • Gently flatten the tops with your fingers or the bottom of a glass.

Baking

  • Bake for 9–11 minutes, until the edges are firm but the centers are soft and slightly underbaked.
  • Allow the cookies to cool completely before topping them with the ganache.

Preparing the Ganache

  • Heat the heavy cream until hot but not boiling.
  • Pour the hot cream over the chocolate chips in a bowl. Let sit for 1-2 minutes, then stir until smooth.
  • Let the ganache thicken slightly for 5-10 minutes before spooning it onto the cooled cookies.
  • Sprinkle the rainbow candies or mini M&Ms on top immediately; allow to set.

Notes

To ensure cookies remain fudgy, do not overbake them. Options for healthier substitutions include using sugar substitutes and dairy-free ingredients.