Preheat oven to 350 F and line baking sheets with parchment paper.
In a large bowl beat butter, white sugar, and brown sugar until light and fluffy (usually takes 5 minutes).
Add in peanut butter and mix until ingredients are well combined.
Mix in eggs and vanilla.
In a separate medium sized bowl whisk together flour, baking soda, and salt.
Add the dry ingredients to the wet and mix just until no flour streaks remain.
Dived the dough into half. Placing one half aside.
With the remaining half, add in the cocoa powder, and mix till fully combined.
To swirl the two doughs together rip off parts of each dough and squish them together to form a large ball. The rip dough ball in half a few more times. Squishing it back together. (See photo above)
Once dough is all mixed together, scoop dough into 3 tbsp balls and place on the lined cookie sheet 2 inches apart.
Bake for 11 minutes or until the bottoms are golden brown. The cookies will looked puffed up but will flatten while cooling.Let cookies fully cool to room temperature on the pan before moving.
