Toffee Bars
["1/2 lb. oleo", "2 c. flour", "1 c. brown sugar", "1 egg yolk", "1 tsp. vanilla", "6 oz. semi-sweet chocolate chips"]
["Cream oleo and sugar; add egg yolk, flour and vanilla.", "Spread on 10 x 15-inch cookie sheet.", "Bake at 350\u00b0 for 15 to 20 minutes, until light brown.", "While warm, sprinkle chocolate chips on. Spread around to cover.", "Add nuts on top if desired."]
["oleo", "flour", "brown sugar", "egg yolk", "vanilla", "semi-sweet chocolate chips"]