Mccartney Fudge
["24 oz. semi-sweet chocolate chips", "2 c. chopped nuts (optional)", "5 to 7 oz. marshmallow whip", "1/2 lb. margarine", "1 tsp. vanilla", "4 1/2 c. sugar", "1 can Pet milk"]
["In a large bowl, mix semi-sweet chocolate chips, chopped nuts, marshmallow, margarine and vanilla.", "In a 3-quart saucepan, mix sugar and milk.", "Cook over medium high heat; stir constantly. When mixture boils, continue cooking 6 minutes.", "Stir constantly. Pour ingredients in bowl; stir until chips dissolve and mixture is smooth.", "Pour into a 9 x 13-inch buttered pan.", "Let set 6 hours or overnight.", "Refrigerates well.", "Let stand at room temperature for easy cutting."]
["semi-sweet chocolate chips", "nuts", "marshmallow whip", "margarine", "vanilla", "sugar", "Pet milk"]