Combine peanut butter and powdered sugar and using an electric mixer, mix together until smooth.

Place the bowl in the freezer while making the cookie dough.

Once the cookie dough is made, remove the bowl from the freezer. Using your hands, take a little more than a teaspoon of the peanut butter mixture and roll between your hands to form a ball. Do this with the rest of the peanut butter. You should have at least 20 peanut butter balls.

Preheat the oven to 350 degrees. Line a baking sheet with parchment paper or a silicone mat.

Using a hand or stand mixer, cream together butter, brown sugar and granulated sugar for about 2 minutes. Add eggs and vanilla and mix until combined.

In a separate bowl, combine flour, cocoa powder, baking soda and salt. Add the dry ingredients to the butter mixture and mix on low until just combined. Don't overmix! Stir in the chocolate chips.

Take about ¼ cup of cookie dough and flatten into a disc using your hands. Place a peanut butter ball in the middle and fold the dough up and around the peanut butter to completely seal it inside. Repeat with the remaining cookie dough and peanut butter balls.

Place 6 cookies at a time on the parchment lined baking sheet.

Bake for about 12 minutes. It is better to underbake than overbake! Transfer to a cooling rack to cool completely after cooling on the cookie sheet for 2-3 minutes.