Toffee Bars
["1 c. butter", "1 c. brown sugar", "1 egg yolk", "1 tsp. vanilla", "2 c. flour", "1 c. chocolate chips", "1 c. walnuts"]
["Cream butter, brown sugar, egg yolk and vanilla.", "Add flour and mix well.", "Stir in chocolate chips and walnuts.", "Put in ungreased 15 1/2 x 10 1/2 x 1-inch baking pan.", "Bake at 350\u00b0 for 18 to 20 minutes.", "While warm, cut in bars.", "Cool.", "Makes 48 bars."]
["butter", "brown sugar", "egg yolk", "vanilla", "flour", "chocolate chips", "walnuts"]