Double Chocolate Fudge Recipe

Line a 15x10x1-in. pan with foil; grease foil with 1-1/2 teaspoons butter. In a heavy large saucepan, combine sugar, milk, salt and remaining butter. Bring to a rapid boil over medium heat, stirring constantly. Cook 5 minutes, stirring constantly. Remove from heat. Stir in marshmallow creme until melted. Stir in both chocolates until melted. If desired, stir in walnuts. Immediately spread into prepared pan. Refrigerate until firm. Using foil, lift fudge from pan. Remove foil; cut fudge into 1-in. squares. Store between layers of waxed paper in airtight containers in the refrigerator.