1Heat oven to 375ºF. Stir together 1/2 cup granulated sugar, the brown sugar, peanut butter, butter, shortening and egg. Stir in flour, baking soda and baking powder.
2Shape dough into 1-inch balls; roll in granulated sugar. Place about 2 inches apart on ungreased cookie sheet.
3Bake 8 to 10 minutes or until edges are light brown. Immediately press 1 chocolate star firmly in each cookie; cool on wire rack.