Marshmallow Fudge

2-1/4 cups sugar
3/4 cup evaporated milk
1 cup marshmallow cream OR 16 large marshmallows instead of the marshmallow cream
1/4 cup butter
1/4 teaspoon salt
1 cup semisweet chocolate chips
1 teaspoon vanilla
1 cup chopped nuts

Mix sugar, evaporated milk, butter and salt in heavy saucepan. Cook, stirring constantly, over medium heat to an all-over boil. Boil and stir 5 minutes. Stir in chocolate chips and marshmallow until completely melted. Add vanilla and nuts. Spread in buttered 8" square pan