Preheat your oven to 350°F (175°C).
In a mixing bowl, combine melted butter, sugar, and brown sugar.
Add eggs and vanilla extract, and mix well.
In another bowl, whisk together flour, cocoa powder, baking powder, and salt.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
Fold in the chocolate chips.
Drop spoonfuls of dough onto a baking sheet lined with parchment paper.
Bake for 10-12 minutes, or until the edges are set but the centers are still soft.
Allow to cool on the baking sheet for a few minutes before transferring to a wire rack to cool completely.