Cream together butter, peanut butter and sugars. Beat in eggs.
In a separate bowl, sift together flour, baking powder, and baking soda. Stir into batter along with the peanut butter chips.
Roll into 1 1/4" balls, dip in white sugar, put on baking sheets and press with the tines of a fork. Bake in a preheated 350 degrees F oven for about 9 minutes or until cookies begin to brown. Let stand on the sheet for 2 minutes. Transfer to a rack to cool completely. Do not over-bake.