Mix in a heavy 2 quart saucepan: sugar, butter, evaporated milk and marshmallow cream
Bring to a bubbling boil over medium heat stirring (preferably with wooden spoon) constantly
When bubbles appear all over top, stir for 8 more minutes
Remove from heat and add the chocolate chips
Stir until completely melted and blended into mixture
Add vanilla and if you want nuts, add them at this time
Pour in lightly buttered 8 or 9-inch square pan
Cool thoroughly and cut into squares
You can use either milk chocolate or semi-sweet chocolate chips
Makes 2 1/4 pounds