Cream shortening and sugars. Add peanut butter and mix. Stir in beaten egg.
Sift together flour and baking soda and add to creamed mixture. Mix well.
Form the dough into 2 1/2 dozen equal balls. Place on ungreased cookie sheet 2" apart. Flatten with fork dipped in flour, making criss-cross marks with tines of the fork. Bake 10 minutes at 375 degrees F.
