Preheat your oven to 350°F (175°C).
In a bowl, whisk together flour, cocoa powder, baking soda, and salt.
In another bowl, cream the butter, granulated sugar, and brown sugar until fluffy.
Beat in the egg and vanilla extract until well combined.
Gradually add the dry ingredients to the wet mixture, mixing until just combined.
Stir in the creamy peanut butter until fully incorporated.
Fold in the chocolate chips.
Scoop tablespoon-sized dough balls onto a baking sheet lined with parchment paper.
Bake for 10-12 minutes or until edges are set.
Allow cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack.