Whisk together the flour, cocoa powder, salt, baking powder, and baking soda in a small bowl. Set aside.
Combine the butter, granulated sugar, and brown sugar in the bowl of an electric mixer. Beat on medium speed for 1-2 minutes or until light and fluffy. Add the egg and vanilla. Continue to stir until fully incorporated.
Slowly stir in the dry ingredients. Fold in the chocolate chips.
Spoon the dough onto a parchment lined baking tray. You want them to be about 2-3 tablespoons, or golf ball sized. Cover with plastic wrap and chill at least 4 hours or overnight.
Preheat your oven to 350 degrees. Line two cookie trays with parchment paper and place the prepared cookie dough onto the trays, keeping 2 inches between each dough ball.
Bake 8-10 minutes or just until the bottom starts to curl.