Combine sugars, peanut butter and shortening in large bowl. Beat at medium speed of mixer until well blended. Add eggs, one at a time, beating well afer each addition. Combine flour, baking soda and salt. Add gradually to creamed mixture at low speed. Mix just until blended. Stir in peanut butter chips with spoon. (Dough will be stiff.)
Shape into 1 1/2 inch balls. Place 2 inches apart on ungreased baking sheet. Make crisscross marks on top with floured fork tines.
Bake for 8 to 10 minutes or until edges are set and tops are moist. Cool about 8 minutes on baking sheet before removing to flat surface.