Preheat oven to 350°F and line cookie sheets with parchment paper.
In the bowl of a stand mixer fitted with the paddle attachment or in a large bowl with hand mixer, cream together softened butter, brown sugar and granulated sugar until light and fluffy, about 2-3 minutes.
Add eggs, one at a time, beating well after each addition.
Add vanilla extract and mix together.
Add baking soda, salt, cocoa power and all purpose flour, mix on low until fully incorporated.
Stir in peanut butter chips.
Use a medium size cookie scoop or 2 level tablespoons, and place cookie dough scoops 2 inches apart on prepared cookie sheets.
Bake for 8-10 minutes or until center no longer looks wet and glossy.
Let cookies cool 3 minutes on pan, then remove to wire rack to cool completely.