Preheat your oven to 350°F. Line a baking sheet with parchment paper.

In a medium bowl, whisk together the flour, cocoa powder, baking powder, and salt. Set aside.

In a large bowl, cream the softened butter and granulated sugar together until light and fluffy, about 2-3 minutes.

Add the egg and vanilla extract to the butter mixture and mix until well combined.

Gradually add the dry ingredients to the wet ingredients, mixing until just combined.

In a separate bowl, mix the peanut butter and powdered sugar until smooth.

Scoop tablespoon-sized portions of the brownie dough onto the prepared baking sheet, leaving space between each cookie.

Make a small indentation in the center of each cookie and fill it with about a teaspoon of the peanut butter mixture.

Top each cookie with a few chocolate chips.

Bake in the preheated oven for 10-12 minutes, or until the edges are set. Let cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.