Cinnamon Squares
["1 c. butter", "1 c. sugar", "1 egg, separated", "2 c. flour", "2 tsp. cinnamon"]
["Cream butter, sugar and egg yolk.", "Add flour and cinnamon, sifted together.", "Press out on large greased cookie sheet.", "Mark in squares.", "Brush with unbeaten egg white.", "Bake at 325\u00b0 for 45 minutes."]
["butter", "sugar", "egg", "flour", "cinnamon"]