1 cup unsalted butter (margarine can be used, be leads to very oily cookies).

1 cup peanut butter

1 cup white sugar

1 cup packed brown sugar

2 eggs

2 1/2 cups all-purpose flour

1 teaspoon baking powder

1/2 teaspoon salt

1 1/2 teaspoons baking soda

Cream butter, peanut butter, and sugars together in a bowl; beat in eggs.

In a separate bowl, sift flour, baking powder, baking soda, and salt; stir into butter mixture. Put dough in refrigerator for 1 hour.

Roll dough into 1 inch balls and put on baking sheets. Flatten each ball with a fork, making a crisscross pattern. Bake in a preheated 375 degrees F oven for about 10 minutes or until cookies begin to brown.