Shortbread Cookies
["1 lb. butter (not margarine), softened", "4 c. plain flour", "1 1/2 c. powdered sugar", "1 tsp. soda"]
["Mix butter and sugar.", "Add flour and soda.", "Form into 2 logs. If too soft to work with, put in refrigerator for awhile.", "(You can mix chopped nuts, if desired.)", "Chill well before slicing about 1/3-inch thick. Bake at 350\u00b0 until slightly brown on ungreased cookie sheet. Do not overcook."]
["butter", "flour", "powdered sugar", "soda"]