Preheat over to 375
Beat butter, peanut butter, white sugar, brown sugar, baking soda and baking powder.
Add egg and beat until combined.
Mix in flour until the dough begins to form a ball.
Optional: add mix ins like chocolate chips/chunks.
Portion cookies into balls and store dough in fridge between batches.
Bake for 8 minutes or until edges begin to golden.