Triple Layer Chocolate Bars
["1 1/2 c. graham cracker crumbs", "1/2 c. cocoa, divided into 1/4 c.", "1/3 c. margarine, melted", "1 (14 oz.) can sweetened condensed milk", "1 egg", "1 tsp. vanilla extract", "1/2 tsp. baking powder", "3/4 c. chopped nuts", "2 c. (12 oz. pkg.) semi-sweet chocolate chips", "1/4 c. all-purpose flour"]
["Heat oven to 350\u00b0.", "Combine crumbs, 1/4 cup cocoa, sugar and butter.", "Press into bottom of 9 x 13-inch baking pan.", "In large bowl beat milk, flour, remaining cocoa, egg, vanilla and baking powder.", "Stir in nuts.", "Spread over crust and top with chocolate chips.", "Bake 20 to 25 minutes or until set.", "Cool and cut into bars.", "Store tightly covered at room temperature."]
["graham cracker crumbs", "cocoa", "margarine", "condensed milk", "egg", "vanilla extract", "baking powder", "nuts", "semi-sweet chocolate chips", "all-purpose"]