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Cosmic Brownie Cookies: The Ultimate Fudgy Cookie Recipe

Indulge in rich, fudgy cosmic brownie cookies filled with colorful rainbow chips for a nostalgic treat that's bakery-fresh and irresistibly chewy. A homemade upgrade of Little Debbie's classic cosmic brownies—perfect for bakers who love fun and flavor.
Prep Time 15 minutes
Cook Time 12 minutes
Total Time 27 minutes
Servings: 36 servings
Course: Dessert
Cuisine: American
Calories: 245

Ingredients
  

  • FOR THE COOKIES:
  • 1 cup (226g) unsalted butter, melted and cooled
  • 2 cups (400g) granulated sugar
  • 4 large eggs, at room temperature
  • 1 teaspoon pure vanilla extract
  • 1¼ cups (150g) natural unsweetened cocoa powder, sifted
  • 2 cups (250g) all-purpose flour, spooned and leveled
  • 1½ teaspoons baking powder
  • 1 teaspoon fine sea salt
  • 1 cup (170g) rainbow chocolate baking chips

Equipment

  • Large mixing bowl
  • Electric hand mixer or whisk
  • Spatula
  • Baking sheet
  • Parchment paper
  • Cookie scoop

Method
 

  1. cosmic brownie cookies recipeCard1
  2. Preheat oven to 350°F (175°C). Line a baking sheet with parchment paper and set aside. In a large bowl, beat melted and cooled butter with sugar using a hand mixer or whisk until smooth and slightly thickened, about 2–3 minutes. This step creates the fudgy base and crackled top texture.
  3. Add eggs one at a time, mixing well after each addition, followed by the vanilla extract. Ensure each egg is fully incorporated before adding the next to prevent curdling. The batter should be glossy and emulsified.
  4. In a separate bowl, sift together cocoa powder, flour, baking powder, and salt. This ensures no lumps and even rising. Whisk dry ingredients thoroughly before adding to wet mixture.
  5. Gently fold the dry ingredients into the wet batter using a spatula. Mix only until combined—overmixing can lead to tough cookies due to gluten development. Stop as soon as no streaks of flour remain.
  6. Fold in ¾ cup of the rainbow chocolate chips, reserving the rest to press on top after scooping. The chips should be evenly distributed but not broken. Use baking-safe rainbow chips to prevent color bleed.
  7. Use a medium cookie scoop (about 1½ tablespoons) to form dough balls. Place on prepared baking sheet about 2 inches apart. Press a few extra rainbow chips on top for visual appeal. Chill for 15 minutes if desired for thicker cookies.
  8. Bake for 10–12 minutes, or until edges are set and centers still look slightly underdone. Remove and let cool on the pan for 3 minutes before transferring to a wire rack. Cool completely before serving for best texture.

Nutrition

Calories: 245 | Carbohydrates: 35 | Protein: 3 | Fat: 11 | Fiber: 2 | Sugar: 25

Notes

STORAGE: Store in an airtight container at room temperature for up to 5 days. For longer storage, freeze for up to 3 months—thaw at room temperature or warm in oven.
MAKE AHEAD: Dough balls can be refrigerated for 24 hours or frozen for up to 3 months; bake from frozen, adding 1–2 minutes to bake time.
SUBSTITUTIONS: For a dairy-free version, use plant-based butter and dairy-free chocolate chips. Gluten-free flour works as a 1:1 substitute if blend contains xanthan gum.
PRO TIPS: Use room-temperature eggs and cooled butter for best emulsification. Sift dry ingredients to prevent clumps. Underbake slightly for fudgy centers.
SERVING SUGGESTIONS: Serve with a glass of cold milk, stack into ice cream sandwiches, or crumble over sundaes for added texture.
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