Preheat your oven to 350°F (175°C).
In a large mixing bowl, cream together the softened butter, granulated sugar, and brown sugar until fluffy.
Add the eggs one at a time, mixing well after each addition, followed by the vanilla extract.
In a separate bowl, sift together the flour, cocoa powder, baking powder, and salt.
Gradually mix the dry ingredients into the wet ingredients until just combined.
Fold in the chocolate chips and sprinkles until evenly distributed.
Scoop tablespoon-sized balls of dough onto a parchment-lined baking sheet, leaving space between each.
Bake for 10-12 minutes or until the edges are firm but the centers are soft.
Allow the cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack.
Enjoy your Cosmic Brownie Cookies warm or at room temperature.
