In a large mixing bowl, cream together shortening, butter or margarine, and peanut butter with electric mixer on medium speed. Gradually add both sugar. Beat in eggs, one at a time until light and fluffy.
In a separate medium mixing bowl, combine flour, baking soda, and salt. Gradually add dry ingredients to creamed mixture; beat until well blended. Stir in peanuts.
Drop dough by rounded teaspoonsful onto ungreased cookie sheets. Bake for 12-15 minutes or until golden brown.