Mix together in bowl:
1 cup softened butter
1 cup creamy peanut butter
2 eggs
1 cup sugar
1 cup brown sugar
2 1/2 cups flour
1 tsp baking powder
1/2 tsp salt
1 1/2 tsp baking soda
Roll or scoop into balls, and mash down lightly in a criss cross pattern with a fork dipped in granulated sugar.
Bake for 8-10 minutes at 375.