Preheat oven to 375°. In a large bowl, cream shortening, peanut butter and sugars until light and fluffy, 5-7 minutes. Add eggs, 1 at a time, beating well after each addition. Combine flour, baking soda and salt; add to creamed mixture and mix well. , Roll into 1-1/2-in. balls. Place 3 in. apart on ungreased baking sheets. Flatten with a meat mallet or fork if desired. Bake 10-15 minutes. Remove to wire racks to cool.