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These cosmic brownie cookies are rich, fudgy, and topped with a smooth chocolate ganache and colourful sprinkles. Like a fudgy brownie in cookie form!

Why You’ll Love These Cosmic Brownie Cookies

If you love rich, chocolatey desserts, these cosmic brownie cookies are going to be your new favourite. They’re soft, fudgy, and topped with silky ganache and rainbow chocolate pieces, just like the classic Cosmic Brownies.

Inspired by the nostalgic store-bought brownies, these cookies have all the flavour but with a homemade twist. They’re quick, easy, and perfect for any chocolate lover.

What Makes This Recipe Special?

These cookies have the texture of a fudgy brownie but in cookie form. The combination of butter, brown sugar, and honey makes them soft and chewy, while the ganache topping gives them that signature glossy finish.

The rainbow sprinkles or chocolate candies add a fun, colourful touch, making them look just as good as they taste.

Equipment You’ll Need

To make these cosmic brownie cookies, you’ll need:

Mixing bowls – For the cookie dough and ganache.
Electric whisk or stand mixer – To cream the butter and sugar.
Large baking tray or cookie sheet – For baking the cookies evenly.
Saucepan or microwave-safe bowl – For melting the ganache.
Spoon – For spreading the ganache on the cookies.

Why This Recipe Works So Well

Brownie-Like Texture: These cookies have a soft centre, and chewy edges.
Smooth Ganache Topping: The chocolate glaze adds extra richness and a glossy finish.
Simple to Make: No chilling required—just mix, bake, and decorate.
Customisable: Decorate with rainbow sprinkles, chocolate candies, or extra melted chocolate.

Ingredients for Cosmic Brownie Cookies

For the Cookie Dough:

110g (½ cup) unsalted butter, softened
100g (½ cup) light brown sugar
60g (¼ cup) granulated sugar
1 large egg
1 tsp vanilla extract
2 tbsp honey or golden syrup
180g (1 ½ cups) plain flour (all-purpose flour)
50g (½ cup) cocoa powder
¼ tsp bicarbonate of soda (baking soda)
½ tsp salt

For the Topping:

100g (½ cup) dark chocolate chips
60ml (¼ cup) double cream (heavy cream)
Rainbow sprinkles or chocolate pieces (Sainsbury’s rainbow chocolate beans recommended)

This recipe makes 9 cookies.

How to Make Cosmic Brownie Cookies

Preheat your oven to 180°C (160°C fan) / 350°F.

Step 1: Cream the Butter and Sugars

In a large mixing bowl, beat together the softened butter, light brown sugar, and granulated sugar with an electric mixer until light and fluffy.

Step 2: Add the Wet Ingredients

Mix in the egg, vanilla extract, and honey (or golden syrup) until fully combined.

Step 3: Add the Dry Ingredients

Sift in the plain flour, cocoa powder, bicarbonate of soda, and salt. Mix until just combined, forming a soft dough.

Step 4: Shape the Cookies

Scoop the cookie dough into 9 equal portions and roll into balls. Place them on a lined baking tray or non-stick cookie sheet leaving space between each cookie as they will spread.

Step 5: Bake the Cookies

Bake for 10–11 minutes. The cookies should still look slightly underbaked in the centre when removed from the oven—this ensures a fudgy texture.

Step 6: Cool the Cookies

Let the cookies cool completely on the tray before adding the ganache.

How to Make the Ganache Topping

Step 7: Heat the Cream

In a small microwave-safe bowl or saucepan, heat the double cream until just warm—do not let it boil.

Step 8: Melt the Chocolate

Pour the warm cream over the dark chocolate chips. Let sit for 1–2 minutes, then stir until smooth and glossy. Alternatively, you can melt the chocolate and cream together in the microwave on a medium heat for 1 minute, stirring gently until melted and smooth.

Step 9: Top the Cookies

Spoon a small amount of ganache onto each cooled cookie, spreading it evenly.

Sprinkle with rainbow chocolate pieces or sprinkles while the ganache is still soft, then let it set in the fridge. Best eaten at room temperature.

Why This Recipe is Perfect for Any Occasion

These cosmic brownie cookies are perfect for birthdays, parties, or when you want a fun and chocolatey bake.

Since they’re quick and easy to make, they’re ideal for weekend baking or a homemade gift.

Tips for the Best Cosmic Brownie Cookies

Don’t Overbake: The cookies should look slightly underbaked in the centre—they firm up as they cool.
Let the Cookies Cool Before Adding Ganache: This prevents the chocolate from melting too much.
Decorate Immediately: Add the sprinkles while the ganache is soft so they stick properly.
Store in the fridge, eat at Room Temperature: Keep cookies in an airtight container in the fridge for up to 4 days, take them out to come to room temperature before eating them.

Serving Suggestions

These cosmic brownie cookies are delicious on their own, but here are some fun ways to serve them:

With a Glass of Milk: Classic and perfect for dunking.
Warm with a Scoop of Ice Cream: Chocolate or vanilla ice cream pairs beautifully.

Storage Tips

Store in an airtight container in the fridge for up to 4 days.
Allow the cookies to come back to room temperature before serving.
Freeze unbaked dough balls for up to 2 months. Bake from frozen, adding 1–2 extra minutes to the baking time.

Watch My Step-by-Step Video

Want to see exactly how it’s done? Watch my full tutorial on the Fitwaffle Kitchen YouTube channel.

For more chocolate-filled bakes, follow me on Instagram @fitwafflekitchen and TikTok @fitwaffle .

Why You’ll Keep Coming Back to This Recipe

These cosmic brownie cookies are rich, fudgy, and packed with chocolate flavour.

The combination of soft brownie-style cookies, smooth ganache, and colourful sprinkles makes them fun, nostalgic, and delicious.

Once you try them, you’ll want to make them again and again!

Other Recipes to Try

If you loved these cosmic brownie cookies, check out these other delicious chocolate bakes from Fitwaffle Kitchen:

Small Batch Fudgy Brownies: Thick, rich, and packed with chocolate.
Nutella Stuffed Chocolate Chip Cookie Sandwiches: Soft, buttery cookies filled with melty Nutella.

Both are quick, simple, and absolutely delicious!

Cosmic Brownie Cookies

These cosmic brownie cookies are rich, fudgy, and topped with a smooth chocolate ganache and colourful sprinkles.

5 from 1 vote

Print Pin Rate

Course: Dessert

Cuisine: American

Keyword: Brownies, chocolate, Chocolate Cookies, Cookies

Prep Time: 15

Cook Time: 10

Servings:

Ingredients