The edges of these cookies set before the centers do, and that’s exactly what I want to see when I open the oven. They look a little soft in the middle at first, then settle into a fudgy brownie texture as they cool. I’ve made these Cosmic Brownie Cookies for the days when a pan of brownies feels like too much commitment but a plain chocolate cookie won’t quite do.
The dough gets a short rest in the refrigerator before it’s portioned, which makes it easier to handle after the butter has been melted. A smooth chocolate ganache and a shower of rainbow candy-coated chips give each cookie that familiar cosmic brownie look, without taking away the soft center. Once the ganache sets, the tops are glossy and the cookies are ready to pick up and eat.
Kitchen Note
I wait until the cookies are completely cool before adding the ganache. Even a little warmth softens the topping, so it won’t sit in a smooth layer over the cookie.
Save these Cosmic Brownie Cookies for a chocolate craving that calls for soft brownie centers, glossy ganache, and rainbow chips.
Why the Dough Needs a Refrigerator Break Before Baking
Melted butter gives these cookies their rich, brownie-like bite, but it also makes the freshly mixed dough soft. Give it 30 minutes in the refrigerator and it firms enough to scoop into tidy portions instead of smearing across the scoop or your hands. That rest also gives the flour time to hydrate, so the dough feels more cohesive when you portion it.
Skipping the chill is the easiest way to end up with cookies that spread more than you expect. They need room on the baking sheets, but you still want a round cookie with a soft middle—not a thin, lacy edge. The dough should feel cool and manageable when you scoop it. If it still feels loose after the rest, give it a little more time in the refrigerator rather than adding extra flour, which can make the finished cookies dry.
What Gives These Cookies Their Brownie-Like Center
- All-purpose flour and cocoa powder — Flour gives the dough enough structure to hold a cookie shape, while unsweetened cocoa brings the deep chocolate taste. Use cocoa that smells rich and chocolatey; it’s the main source of that brownie flavor. If you switch to a 1-to-1 gluten-free baking blend, use that in place of the flour rather than adding it alongside.
- Melted butter and the two sugars — Cooling the melted butter before mixing keeps it from warming the eggs. Granulated sugar helps the edges bake up, while packed light brown sugar adds moisture and a softer chew. If salted butter is what you have, use it and leave out the added salt.
- Eggs and vanilla — The eggs bind the dough and help create the tender, slightly soft middle. Large eggs matter here because changing the amount of egg can shift the dough from scoopable to loose. Vanilla rounds out the cocoa rather than making the cookies taste strongly of vanilla.
- Semisweet chocolate and heavy cream — Finely chopped chocolate melts evenly into a smooth topping. A baking bar is a dependable choice; milk won’t make the same ganache because it doesn’t have the richness needed for a thick, spreadable finish.
- Rainbow candy-coated chocolate chips — Their crisp candy shells add color and a little crunch against the smooth topping. Keep them close at hand so they’re ready when the ganache goes on.
Mixing, Baking, and Topping Without Losing the Soft Center
Whisk the Cocoa Dough Until Just Combined
Heat the oven to 350°F and line two baking sheets with parchment paper. Whisk the flour, cocoa powder, baking powder, and salt in a medium bowl so the cocoa is distributed before it meets the wet ingredients. In a large bowl, whisk the melted, cooled butter with both sugars, then whisk in the eggs and vanilla until smooth. Stir in the dry mixture just until no dry streaks remain; mixing well past that point can make the cookies tougher.
Chill and Portion the Dough
Cover the bowl and refrigerate the dough for 30 minutes. Scoop it into 18 portions, about 2 tablespoons each, and leave 2 inches between cookies on the prepared sheets. Keeping the portions close in size helps them bake at the same pace. If the dough sticks to the scoop, pause and chill it a little longer rather than working extra flour into it.
Bake Until the Centers Still Look Soft
Bake for 9–11 minutes, watching for edges that look set while the centers remain slightly soft. Don’t wait for the middle to look completely firm in the oven; it continues to settle as the cookies cool. Leave them on the baking sheets for 10 minutes, then transfer them to a wire rack. Let them cool completely before you start the topping.
Make and Spread the Ganache
Put the finely chopped chocolate in a heatproof bowl. Warm the heavy cream in a small saucepan over medium heat until it’s steaming but not boiling, then pour it over the chocolate and leave it for 3 minutes. Stir until the ganache is smooth; if you stir before the chocolate has had time to soften, small pieces can remain. Spread it over the cooled cookies, add the candy-coated chips right away, and leave the topping until set, about 30 minutes.
Easy Swaps for a Different Batch of Cosmic Brownie Cookies
Make the cookies gluten-free
Replace the all-purpose flour with the same amount of a 1-to-1 gluten-free baking blend formulated for cookies. The dough may feel a little different to scoop, and the finished texture can be slightly less tender, but the cocoa and ganache still give you the brownie-cookie feel.
Use bittersweet chocolate for a darker topping
Swap the semisweet chocolate for the same amount of bittersweet chocolate. The ganache will taste less sweet and more intense, which balances the candy-coated chips nicely; a higher-cocoa chocolate can also set a little firmer.
Trade the chips for chopped candy-coated chocolates
Use the same amount of rainbow candy-coated chocolate candies, roughly chopped, instead of the chips. The larger pieces give the topping a chunkier finish, with the same bright colors and a little more crunch in each bite.
Storage and Reheating
- Refrigerator: Store the topped cookies in an airtight container for up to 4 days. The ganache firms up, and the cookies will be a little denser when cold.
- Freezer: Freeze the fully set cookies in a single layer until firm, then layer them in an airtight container with parchment between the layers. They keep well for up to 2 months, though the candy topping may lose a little of its crispness.
- Reheating: Skip the microwave, which can melt the ganache unevenly. Let refrigerated cookies sit at room temperature for about 20 minutes before serving.
Questions That Come Up When Baking These Cookies
Cosmic Brownie Cookies
Ingredients
Equipment
Method
- Heat the oven to 350°F.
- Line two baking sheets with parchment paper.
- Whisk the flour, cocoa powder, baking powder, and salt in a medium bowl.
- Whisk the melted butter, granulated sugar, and brown sugar in a large bowl.
- Whisk in the eggs and vanilla until smooth.
- Stir the dry ingredients into the butter mixture just until combined.
- Cover and refrigerate the dough for 30 minutes.
- Scoop the dough into 18 portions, about 2 tablespoons each.
- Arrange the portions on the prepared sheets with 2 inches between cookies.
- Bake for 9–11 minutes, until the edges are set and the centers still look slightly soft.
- Cool on the sheets for 10 minutes before transferring to a wire rack to cool completely.
- Put the chopped chocolate in a heatproof bowl.
- Heat the heavy cream in a small saucepan over medium heat until steaming but not boiling.
- Pour the cream over the chocolate and let stand for 3 minutes.
- Stir until smooth.
- Spread the ganache over the cooled cookies.
- Immediately sprinkle with the rainbow candy-coated chocolate chips.
- Let stand until the topping is set, about 30 minutes.
