Toffee Squares
["1 c. butter", "2 c. sifted all-purpose flour", "1 tsp. vanilla", "1 c. brown sugar", "1 egg yolk", "1/2 lb. Hershey chocolate", "1 c. nuts, chopped fine"]
["Cream butter and brown sugar until light and fluffy.", "Add beaten egg yolk, vanilla and sifted flour.", "Spread on 12 x 17 1/2-inch cookie sheet and bake at 350\u00b0."]
["butter", "flour", "vanilla", "brown sugar", "egg yolk", "chocolate", "nuts"]