Cosmic Brownie Cookies
These Cosmic Brownies Cookies are soft, chewy chocolate cookies topped with a rich chocolate ganache and colorful candy coated chips. A fun, nostalgic cookie inspired by classic Cosmic Brownies and perfect for parties, bake sales, or anytime you want a fudgy dessert.
Equipment
- Two baking sheets
- Parchment Paper
- Mixing Bowls
- Whisk and spatula
- Measuring cups and spoons
- Saucepan
- Wire cooling rack
Ingredients
Cookies:
- ½ cup (50 grams) dutch processed cocoa powder
- 1 ½ cups (185 grams) all-purpose flour, spooned and leveled
- 1 teaspoon baking soda
- ½ teaspoon salt
- ½ cup (113 grams) salted butter, melted
- ¾ cup (150 grams) granulated sugar
- ¼ cup (55 grams) brown sugar, packed
- 1 large egg plus 1 egg yolk
- 1 teaspoon vanilla extract
Chocolate Ganache Frosting:
- ¾ cup heavy cream
- 1 cup semisweet chocolate chips
- ½ cup rainbow candy coated chips
Instructions
- Preheat the oven to 350°F and line two baking sheets with parchment paper.
- In a medium sized bowl add flour, cocoa powder, baking soda, and salt and stir to combine. Set aside for now.
- In a large mixing bowl, cream together the butter, granulated sugar, and brown sugar until fully combined.
- Beat in the egg, egg yolk, and vanilla extract until smooth.
- Stir in the flour mixture just until a dough forms.
- Using a 2 inch cookie scoop, drop dough onto the prepared sheets about two inches apart.
- Bake for 7-9 minutes or until the cookies are set around the edges but still soft in the centers. Don’t overcook. Set aside to cool.
- To make frosting, heat heavy cream over medium high heat in a small sauce pan until smoking, but not boiling.
- Immediately pour over chocolate chips. Let sit for 2-3 minutes before whisking. Set in the refrigerator until it cools to a spreadable consistency.
- Spread ganache over each cookie before sprinkling with rainbow candy coated chips.
Notes
Top Tips:
- Don’t overbake. These cookies should remain soft in the center. They’ll continue to firm up on the baking sheet as they cool. Overbaking will make them dry instead of chewy.
- Let the ganache set. After spreading the chocolate, allow it to cool and firm up slightly before adding rainbow chips. This prevents them from sliding off. If the ganache feels thin, refrigerate it for 10-15 minutes to firm to a spreadable consistency.
- Use high-quality cocoa. Dutch processed cocoa gives the cookies a rich, deep chocolate flavor and that signature “Cosmic Brownie” taste.
- Cool before frosting. Wait until cookies are fully cooled before adding ganache or it will melt right off.
- Double the batch. These cookies freeze well and are a hit for parties, bake sales, or nostalgic dessert platters.
- Add flair. Sprinkle sea salt on top of the ganache for a sweet-salty balance or use themed colored candies for holidays.
- Leave off the ganache: the ganache adds extra flavor and flair, but these cookies are so tasty on their own. If you don’t feel like taking the extra step to make the frosting, try these plain.