Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a mixing bowl, combine melted butter, granulated sugar, and brown sugar until smooth.
Add eggs and vanilla extract, mixing well until fully incorporated.
In a separate bowl, whisk together flour, cocoa powder, baking powder, and salt.
Gradually add the dry mixture to the wet ingredients, stirring until just combined.
Fold in the chocolate chips until evenly distributed throughout the dough.
Using a cookie scoop, drop rounded tablespoons of dough onto the prepared baking sheet.
Bake for 10-12 minutes or until the edges are set but the centers remain soft.
Allow cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack.
Enjoy your brownie cookies warm or at room temperature!