Toffee Squares
["1 c. butter (no margarine)", "1 c. packed brown sugar", "1 egg yolk", "1 tsp. vanilla", "2 c. flour", "1/4 tsp. salt", "1 to 1 1/2 big Hershey chocolate bars", "1/2 to 1 c. chopped walnuts"]
["Preheat oven to 350\u00b0.", "Cream butter, sugar, yolk and vanilla; stir in flour and salt until blended.", "Pack into rectangular 9 x 13-inch greased baking sheet.", "Bake for 20 to 25 minutes until lightly browned.", "Remove; immediately apply crumbled chocolate bar."]
["butter", "brown sugar", "egg yolk", "vanilla", "flour", "salt", "chocolate bars", "walnuts"]