Bake Cosmic Brownie Cookies in 61 Min

Instructions:

1. In a large bowl, combine the flour, cocoa powder, cornstarch, baking soda, and salt; sift if necessary.
2. In a medium bowl, whisk melted butter and brown sugar until smooth, then beat in the egg and vanilla extract until glossy.
3. Fold the dry ingredients into the wet ingredients using a spatula until no streaks of flour remain.
4. Scoop the dough into 22 balls, place them on a tray, and refrigerate for 30 minutes.
5. Preheat oven to 350°F (175°C) and line baking sheets with parchment paper.
6. Arrange chilled dough balls 2 inches apart on the baking sheets.
7. Bake for 10–12 minutes until edges are set but centers remain slightly under-baked.
8. Let cookies rest on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.
9. Combine chocolate chips and heavy cream in a microwave-safe bowl; heat in 20-second bursts, stirring until smooth.
10. Stir the softened butter into the chocolate mixture for a glossy finish.
11. Spoon approximately 1 tablespoon of ganache onto each cooled cookie and immediately press rainbow chips into the glaze.