1/2 cup butter
1/2 cup peanut butter
1 egg
1/2 cup sugar
1/2 cup brown sugar
1 1/4 cups flour
1/2 tsp. baking powder
3/4 tsp. baking soda
1/4 tsp. salt

Mix butter, peanut butter, egg, sugar and brown sugar together. Add flour, baking powder, baking soda and salt. Mix well. Roll into small balls and press with a fork dipped in powdered sugar to flatten.

Bake 10-12 minutes at 350°F.