Grandma Bischoff's Marshmallow Fudge

This is the promised fudge recipe! Marshmallow Fudge has been a family tradition for 7 or 8 years now. My girls brought the recipe home from "Grandma Marion". In a saucepan add: 1/3c butter; 4 1/2c sugar; 1 can (12oz.) evaporated milk; 1c marshmallow creme; and let it come to a boil-boil 5 1/2 minutes. Take off the heat and add: 1 13oz. chocolate bar; 2 pkgs (12oz each) chocolate chips; 2t vanilla; can add 2c chopped nuts (WE DO NOT!) Stir well and put into a buttered 9x13 cake pan. I like to use Hershey's Special Dark Chocolate for this. It makes about 5 pounds of fudge. I love to take a small bite of this fudge and just let it melt in my mouth. It is wonderful!