Milnot? Fudge

1 cup Milnot?
3 cups granulated sugar
1/3 cup butter or margarine
1 (7 ounce) jar Marshmallow Cr?me
1 (12 ounce) package chocolate chips (2 cups)
1 cup chopped nuts (optional)
1 teaspoon vanilla extract (optional)

Combine sugar, Milnot?, Marshmallow Cr?me and butter in a heavy 3 1/2-quart saucepan. Heat lowly to boiling, stirring frequently. When mixture boils vigorously (so that boiling cannot be slowed by stirring), start timing; continue boiling for 4 minutes, stirring constantly. Remove from heat. Stir in chocolate chips until melted. Add nuts and vanilla extract. Pour into buttered 9-inch square pan. Cool at room temperature.

Yields almost 3 pounds.

Variations
Substitute butterscotch or peanut butter chips for chocolate chips.