Rich Scottish Shortbread
["2 c. unsalted butter", "1 c. powdered sugar", "4 c. flour"]
["Cream butter and sugar.", "Work in flour.", "Press into molds or baking pan.", "Bake at 325\u00b0 for 30 to 45 minutes until light golden brown."]
["unsalted butter", "powdered sugar", "flour"]