Microwave Fudge

2-1/4 c. sugar
3/4 c. evaporated milk
1/4 c. margarine
1/4 tsp. salt
1 c. marshmallow cream (or 16 lg. marshmallows)
6 oz. pkg. 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.