Creamy Chocolate Walnut Fudge

Bahan-bahan (24 porsi)

• 1½ cups granulated white sugar
• One 7-ounce jar marshmallow creme
• ⅔ cup evaporated milk
• 4 tablespoons butter
• ¼ teaspoon salt
• 2 cups semisweet chocolate chips
• 1 cup milk chocolate chips
• ½ cup chopped walnuts, (toasted)
• 1 teaspoon vanilla extract