Toffee Diamonds
["1 c. (1/2 lb.) butter or margarine", "1 c. brown sugar", "1 egg, separated", "2 c. flour", "1 tsp. cinnamon", "1 c. chopped nuts"]
["Cream butter and sugar.", "Add egg yolk.", "Sift flour and cinnamon; add to butter mixture.", "Spread dough evenly over greased 10 x 15-inch pan (a pizza roller smooths dough quickly)."]
["butter", "brown sugar", "egg", "flour", "cinnamon", "nuts"]