Chocolate Nut Toffee Bars
["1 c. margarine or butter", "1 c. confectioners sugar", "1 1/4 c. unsifted flour", "1/3 c. Hershey's cocoa", "1 (14 oz.) can sweetened condensed milk", "2 tsp. vanilla extract", "1 c. semi-sweet chocolate chips", "2 tsp. vanilla extract", "1 c. semi-sweet chocolate chips", "1/2 c. chopped nuts"]
["Preheat oven to 350\u00b0.", "Reserve 2 tablespoons margarine.", "In large mixer bowl, beat remaining margarine and sugar until fluffy.", "Add flour and cocoa; mix well.", "With floured hands, press into greased 13 x 9-inch baking pan.", "Bake 15 minutes. Meanwhile, in medium saucepan, combine reserved margarine and sweetened condensed milk; cook and stir until mixture thickens slightly, about 15 minutes.", "Remove from heat; stir in vanilla. Pour over crust.", "Bake 10 to 15 minutes longer or until golden brown.", "Remove from oven; immediately top with chips.", "Let stand 1 minute; spread while warm.", "Top with nuts.", "Cool.", "Cut into bars. Store covered."]
["margarine", "confectioners sugar", "flour", "cocoa", "condensed milk", "vanilla extract", "semi-sweet chocolate chips", "vanilla extract", "semi-sweet chocolate chips", "nuts"]