Crisp Toffee Bars
["1 c. butter or margarine", "1 c. brown sugar", "1 tsp. vanilla", "2 c. sifted plain flour", "1 (6 oz.) pkg. semi-sweet chocolate pieces", "1 c. chopped California walnuts"]
["Thoroughly cream together margarine, sugar and vanilla.", "Add flour; mix well.", "Stir in chocolate pieces and walnuts.", "Press mixture into ungreased 15 1/2 x 10 1/2 x 1-inch jelly roll pan. Bake in moderate oven (350\u00b0) 25 minutes or until browned.", "While warm, cut in bars or squares.", "Cool before removing from pan. Makes about 5 dozen."]
["butter", "brown sugar", "vanilla", "flour", "semi-sweet chocolate pieces", "California walnuts"]