Preheat oven to 350 degrees F. In bowl, cream butter, peanut butter, sugars, vanilla and egg. Combine flour, baking powder and baking soda.  Add dry ingredients to peanut butter mixture and mix thoroughly.  Shape dough into 1" balls. Place about 2" apart on a baking sheet. Flatten with a fork in a criss cross pattern. Bake in oven for 10 minutes, or until lightly brown. Sprinkle with sugar and allow to cool.

 

Yields: 5 dozen cookies.