Toffee Bars
["1 c. margarine", "1 c. brown sugar", "1 egg yolk", "2 c. flour", "1/4 tsp. salt", "1 tsp. vanilla"]
["Cream together margarine, brown sugar and egg yolk.", "Stir in flour, salt and vanilla.", "Spread in 9 x 13-inch pan.", "Bake at 350\u00b0 for 25 minutes.", "Frost with melted Hershey bar."]
["margarine", "brown sugar", "egg yolk", "flour", "salt", "vanilla"]