Classic Peanut Butter Cookies

1 cup unsalted butter
 1 cup crunchy 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

1. Cream together butter, peanut butter and sugars. Beat in eggs.
2. In a separate bowl, sift together flour, baking powder, baking soda, and salt. Stir into batter. Put batter in refrigerator for 1 hour.
3. Roll into 1 inch balls and put on baking sheets. Flatten each ball with a fork, making a criss-cross pattern. Bake in a preheated 375 degrees F oven for about 10 minutes or until cookies begin to brown. Do not over-bake.