Mystery Squares
["1 pkg. graham crackers, crushed", "1/2 c. butter, melted", "1 c. walnuts", "1 c. chocolate chips", "1 1/2 c. coconut (if desired)", "1 (14 oz.) can condensed milk"]
["Mix graham crackers and butter together.", "Line 9 x 14-inch pan with this mixture.", "Mix walnuts, chocolate chips and coconut; spread over crust.", "Pour condensed milk over the top and bake at 350\u00b0 for 35 to 40 minutes."]
["graham crackers", "butter", "walnuts", "chocolate chips", "coconut", "condensed milk"]