sift together first 3 ingredients. Cream together peanut butter, shortening and sugars. Blend in egg. Stir in dry ingredients. Shape into small balls (1 tbsp) and place about 3 inches apart on greased cookie sheet. Press with floured fork. Bake in preheated oven at 350 degree oven for 10-12 minutes or until nicely browned. Makes 3 dozen cookies.