Directions:
Combine the sugar, brown sugar, peanut butter, shortening and butter in a mixing bowl. Mix until well combined. Stir in flour baking powder, baking soda and salt. Wrap the dough in plastic wrap and refrigerated until well-chilled, about 2 hours.
Preheat oven to 375ºF.
Roll the dough into balls about 1 1/4 inch wide. Place about 3 inches apart on a baking sheet. Flatten the balls using a potato masher or a fork that has been dipped in the extra granulated sugar.
Bake for 10-12 minutes, or until lightly browned. Allow to cool for 1 minute on the baking sheet before removing to a cooling rack to cool completely.
Makes about 2 1/2 dozen cookies.