Preheat oven to 375 degrees.
Blend butter, peanut butter and eggs until fluffy.
Add brown sugar and white sugar to butter mixture and mix well.
Add flour, baking powder, salt and baking soda to mixture and mix well.
Roll dough in 1-2" balls and place on greased cookie sheet, or cookie sheet coated with parchment paper.
Cookies will spread out when baked so leave plenty of space between them.
Taking a wet fork, dip the fork into a small bowl of sugar and make a criss cross pattern on each cookie, flattening them out slightly.
Bake for 8-10 minutes.
Cool on cookie sheet and then transfer.