Pre-heat the oven to 350 degrees and line a cookie sheet with either parchment paper or a silicon mat.
In a large bowl, add the softened butter, brown sugar, and peanut butter. Beat together on medium speed for about 2 minutes until the mixture is light and fluffy.
Add in the egg and vanilla and beat again for one more minute.
In a separate bowl, mix together the flour, cocoa powder, baking soda, and baking powder.
Add the dry mixture to the wet peanut butter mixture and mix with a spatula until everything is incorporated together and you have a thick dough.
Fold in the chocolate chips with the spatula.
Add the powdered sugar to a small bowl.
Scoop out your dough and form balls (a little smaller than a golfball or about a heaping tablespoon) and roll each one in the powdered sugar to coat.
Place on your cookie sheet about 2 inches apart and bake for 15 minutes.
Allow to cool on the pan for about 10 minutes then you can move them to a flat plate or cookie rack to finish cooling.