Ingredients
- 1/2 cup unsalted butter, softened
- 1/2 cup brown sugar
- 1/4 cup granulated sugar
- 2 eggs
- 1 tsp vanilla extract
- 1 1/2 cups all-purpose flour
- 1/2 cup unsweetened cocoa powder
- 1 tsp baking soda
- 1/4 tsp salt
- 1/2 cup semi-sweet chocolate chips (optional)
- 1/4 cup heavy cream
- 1 cup powdered sugar
- 1/2 cup chocolate chips or chopped chocolate (for frosting)
- 1/2 cup rainbow candy-coated chocolate chips (like mini M&Ms or rainbow chips)
Instructions
- Preheat the oven to 350°F (175°C) and line a baking sheet with parchment paper.
- Cream together the butter, brown sugar, and granulated sugar in a mixing bowl until light and fluffy.
- Beat in the eggs and vanilla extract until well combined.
- In a separate bowl, whisk together the flour, cocoa powder, baking soda, and salt.
- Gradually mix the dry ingredients into the wet mixture until a thick dough forms. Stir in semi-sweet chocolate chips for extra chocolate richness if desired.
- Using a cookie scoop or spoon, portion the dough into balls and place them on the baking sheet, leaving space between each cookie.
- Bake the cookies for 8–10 minutes, just until the edges are set but the centers are soft. Let them cool completely on a wire rack.
- While the cookies cool, make the frosting by melting chocolate with butter and a splash of heavy cream, then stir in powdered sugar until smooth and glossy.
- Spread the frosting over each cooled cookie and immediately top with rainbow chips before the frosting sets.
Notes
- These cookies can be made without frosting, but the frosting and rainbow chips give them the signature cosmic brownie look and flavor.
- If short on time, you can use store-bought chocolate frosting. Just be sure the cookies are completely cool before frosting.
- To keep cookies soft, don’t overbake them and store them in an airtight container with a slice of bread to retain moisture.
- Dough can be made ahead and refrigerated for up to 48 hours. Let it sit at room temperature for 10 minutes before baking.
- For a festive variation, use holiday-colored sprinkles or mini M&Ms as toppings.
- Prep Time: 20 minutes
- Cook Time: 10 minutes
- Category: Dessert
- Method: Baking
- Cuisine: American
- Diet: Vegetarian
Nutrition
- Serving Size: 1 cookie
- Calories: 250
- Sugar: 24g
- Sodium: 90mg
- Fat: 14g
- Saturated Fat: 8g
- Unsaturated Fat: 6g
- Trans Fat: 0g
- Carbohydrates: 32g
- Fiber: 2g
- Protein: 3g
- Cholesterol: 30mg
