Toffee Bars
["1 c. butter or margarine", "1 c. brown sugar", "1 egg yolk", "1 tsp. vanilla", "2 c. flour", "1/4 tsp. salt", "1 large bar milk chocolate or large bag chips"]
["Mix all ingredients except chocolate together.", "Spread by hand into a greased 10 x 15-inch pan.", "Bake at 350\u00b0 for 15 to 20 minutes.", "Do not overbake.", "While cookies are still warm, spread chocolate over them."]
["butter", "brown sugar", "egg yolk", "vanilla", "flour", "salt", "milk chocolate"]