Shortbread
["1 lb. sweet butter (2 c.)", "1 c. powdered sugar", "3 c. sifted flour", "3/4 c. cornstarch"]
["Cream the butter and add the sugar gradually, but don't overwork it or let it become oily.", "Gradually work in flour and cornstarch."]
["sweet butter", "powdered sugar", "flour", "cornstarch"]