Preheat the oven to 350 F (175 C) and line baking sheets with parchment paper.
Combine melted butter and granulated sugar in a bowl; add eggs one at a time, beating well after each addition. Stir in vanilla extract.
In a separate bowl, whisk together all-purpose flour, cocoa powder, baking powder, and salt.
Gradually add the dry ingredients to the wet ingredients, mixing until a thick, fudgy batter forms. Fold in chocolate chunks or chips.
Using a cookie scoop or tablespoon, drop rounded portions of dough onto the prepared baking sheets.
Bake in the preheated oven for 10-12 minutes or until the edges are set and the centers are slightly soft.
Allow the cookies to cool on the baking sheets for a few minutes before transferring them to a wire rack to cool completely.
Indulge in the decadent bliss of Chocolate Brownie Cookies, with each bite delivering a perfect balance of chewiness and chocolatey richness.
