Easy Fudge

2 1/4 cups sugar
3/4 cup evaporated milk
1/4 cup margarine
1/4 tsp salt
1 cup marshmallow cream OR 16 large marshmallows
6 oz package of semi-sweet chocolate chips
1 tsp vanilla
chopped nuts (optional)

Mix together sugar, evaporated milk, margarine and salt. Then bring to a boil over medium heat, stirring constantly. Remove mixture from heat and add remaining ingredients. Pour into buttered pan and chill.