These cosmic brownie cookies are based off the Little Debbie version. These are fudgy brownie cookies that are easy to make. They are topped with chocolate ganache and rainbow chocolate candies. These taste just like the little snacks that I used to get in my childhood!

Cosmic brownie cookie on parchment paper.

These cosmic brownie cookies are SO easy to make. The brownie cookies only need 20 minutes of chill time, then they are ready to go!

If you are looking for more brownie recipes, try Mummy Cookies, better than boxed brownies, and peanut butter cup brownies.

Why You Will Love This

  • Brownie cookies- These cookies are fudgy and chewy at the same time!
  • Super chocolaty- The cookies use melted chocolate and cocoa powder.
  • Chocolate ganache- The frosting is a 2 ingredient frosting that is SO easy.

What are Cosmic Brownies?

Cosmic brownies are made by Little Debbie. They are fudgy brownies topped with fudgy icing. They are topped with rainbow candy coated chocolate sprinkles.

I LOVED these brownies as a kid. So, I made this recipe based off those.

A bunch of cookies on parchment paper.

Ingredient Notes

  • Dutch process cocoa powder- I used this one. Using dutch process cocoa powder gives the cookies a stronger chocolaty taste.
  • Butter- Pull this out 2 hours before baking.
  • Chocolate- I used Lindt 70% semi-sweet chocolate. Make sure to use a high quality chocolate. Don’t use chocolate chips.
  • Brown sugar- I used light brown sugar.
  • Eggs- Pull these out 2 hours before baking.
  • Egg yolk- The egg yolk makes them extra fudgy.
  • Rainbow candies- Here is the ones I used.

Step By Step Instructions

Here is how to make and bake these cookies.

STEP 1: Melt the chocolate. First, melt the chocolate in the microwave. Let it cool slightly before mixing into the butter. Otherwise it will melt the butter if it was hot.

STEP 2: Mix dry ingredients. Use a sifter to sift the flour and cocoa powder.

STEP 3: Beat the butter and sugar. Beat the butter and sugars on high for 2 minutes to get it light and fluffy. Next, add in the melted chocolate. Beat on high for 1 minute.

STEP 4: Add in the wet ingredients. Then, add in the vanilla, eggs, and egg yolk. Beat on high for 1 minute to get it fluffy.

STEP 5: Mix in dry ingredients. Slowly mix these in. Mix just until combined. Then, chill the dough for 20 minutes.

Beaten butter and sugar in a glass bowl.
Beaten chocolate in glass bowl.
Beaten wet ingredients.

STEP 6: Scoop the cookie dough. Use a 3 oz cookie scoop and scoop the dough. Bake 6 cookies per cookie sheet. Bake for 13-15 minutes. Cool completely before frosting.

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Chocolate cookie dough in a glass bowl.
Cookie dough balls on a cookie sheet.
Brownie cookie on a wire rack.

STEP 7: Chocolate ganache. Make the chocolate ganache and let it sit on the counter to thicken. When the last batch of cookies go into the oven, place the chocolate in the fridge for 20 minutes to thicken.

STEP 8: Frost the cookies. Use 3/4 TBSP of chocolate ganache per cookie. Spread using an offset spatula and top with the rainbow candies.

Close up of cosmic brownie cookie.

Expert Tips

The cookies need a very short chill time. If they chill for a longer period, the chocolate will solidify and the cookies won’t spread.

Scoop the dough and keep the cookie dough balls at room temperature while the others are baking.

When you are scooping, use exactly 3 oz of cookie dough.

Bite missing from cosmic brownie cookie.

FAQ

Can I make these into small cookies?

Yes you can. Bake for 9-11 minutes. I do recommend baking them bigger to get a fudgier center.

Is this like the crumbl cookie?

Yes it is! However, my cookie are extra fudgy!

Can I freeze the cookie dough?

For this recipe, I don’t recommend this. Since the chocolate solidifies in the fridge, it doesn’t bake the same.

Stack of cookies.

Storing and Freezing

Store these cosmic brownie cookies at room temperature up to 5 days in an airtight container.

Freezing

Freeze the baked cookies in an airtight container and freeze up to 30 days. Thaw for 1-2 hours before eating.

Cookie split in half.

Other Cookie Recipes To Try

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Make sure to tag me on Instagram @stephaniesweettreats. I hope you loved it! To get more ideas follow me on Pinterest.

Cosmic brownie cookie on parchment paper.
5 from 14 reviews

Cosmic Brownie Cookies

Stephanie Rutherford
These cosmic brownie cookies are just like the Little Debbie brownies, but in cookie form. This is a fudgy brownie cookie topped with chocolate ganache and chocolate rainbow candy.
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Prep Time: 30 minutes
Cook Time: 14 minutes
Chilling Time: 20 minutes
Total Time: 1 hour 4 minutes
Servings: 18 Large cookies

Ingredients
 
 

Brownie Cookie

  • 8 oz Semi-sweet chocolate , melted. I used Lindt 70% chocolate.
  • 1 cup All-purpose flour
  • 1/3 cup Dutch process cocoa powder
  • 1 1/4 tsp Baking powder
  • 1 tsp Salt
  • 1/2 cup Unsalted butter, room temperature
  • 1 cup Brown sugar, packed light or dark
  • 1/3 cup White granulated sugar
  • 2 tsp Pure vanilla extract
  • 2 Eggs, room temperature
  • 1 Egg yolk, room temperature

Chocolate Ganache

  • 1 cup Semi-sweet chocolate chips
  • 3/4 cup Heavy cream
  • Chocolate rainbow candies

Instructions
 

Cookies

  • In the microwave, melt the chocolate in 15 second intervals. Let it cool slightly.
    8 oz Semi-sweet chocolate
  • In a mixing bowl, sift the flour and cocoa powder. Add in baking powder and salt.
    1 cup All-purpose flour, 1/3 cup Dutch process cocoa powder, 1 1/4 tsp Baking powder, 1 tsp Salt
  • Using a mixer, beat the butter, brown sugar, and sugar on high for 2 minutes. Add in the melted chocolate. Beat on high for 1 minute. Add in vanilla, eggs, and egg yolk. Beat on high for 1 minutes. It will be light and fluffy.
    1/2 cup Unsalted butter, 1 cup Brown sugar, 1/3 cup White granulated sugar, 2 tsp Pure vanilla extract, 2 Eggs, 1 Egg yolk
  • Add in the dry ingredients. Mix on low until just combined.
  • Preheat oven to 350°F. Line 2 cookie sheets with parchment paper. Chill the dough for 20 minutes.
  • Use a 3oz cookie scoop. Scoop the dough and bake 6 cookies per cookie sheet. Bake for 13-15 minutes.
  • Let the cookies sit for 5 minutes before transferring to a cooling rack. Cool completely.

Chocolate Ganache

  • Start the ganache when the cookies are chilling in the fridge. Heat the heavy cream in a sauce pan over medium-low heat. Heat until hot and steaming. Pour hot cream over chocolate chips.
    1 cup Semi-sweet chocolate chips, 3/4 cup Heavy cream
  • Let it sit for 2 minutes. Stir until smooth. If any chocolate chunks remain, heat in the microwave for 10 seconds until melted.
  • Let the ganache sit until all the cookies are baked and cooled. Chill the chocolate in the fridge for 20 minutes when the last batch of cookies go in the oven. Spread the chocolate over the cookies. Top with the chocolate rainbow candy.
    Chocolate rainbow candies

Notes

Flour- Make sure to spoon and level the flour or use a kitchen scale. Compacted flour can  dry out the cookies.
High altitude baking- Add an extra TBSP of flour.
Calories: 312kcal, Carbohydrates: 34g, Protein: 3g, Fat: 18g, Saturated Fat: 11g, Polyunsaturated Fat: 1g, Monounsaturated Fat: 5g, Trans Fat: 1g, Cholesterol: 58mg, Sodium: 177mg, Potassium: 194mg, Fiber: 3g, Sugar: 24g, Vitamin A: 355IU, Vitamin C: 1mg, Calcium: 56mg, Iron: 2mg
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