2 sticks butter
1 c. peanut butter (smooth)
1 c. dark brown sugar
1 c. white sugar
1 1/2 tsp. vanilla extract
2 eggs
2 1/2 c. plain flour
1 tsp. baking powder
1 tsp. baking soda
1 tsp. salt

Mix first 6 ingredients well. Gradually blend in remaining ingredients. Shape into 1" balls, roll in sugar and place on ungreased cookie sheet. Flatten out with a fork. Bake in 350 degree oven for 10 to 12 minutes or until lightly browned around the edges.