Microwave Fudge

Ingredients:
3 Cups Sugar
3/4 Cups Butter or margarine (1 1/2 sticks)
1 small (5 oz) can evaporated milk (about 2/3 cup)
1 (12 oz) pkg Milk Chocolate Chips
1 (7 oz) jar Marshmellow Créme
1 tsp Vanilla
1 Cup Chopped Walnuts or Pecans (Optional, I'm not a fan of nuts in my fudge!)

Directions:
In a 4-quart microwave safe bowl, microwave butter on high until melted (about 1 minute 30 seconds). Add sugar and milk. Mix well. Microwave for 5 minutes, stir after 3 minutes. Stir well, scraping down the sides of the bowl. Microwave 5 1/2 minutes, stirring after 3 minutes. Let stand for 2 minutes, add chocolate chips and marshmellow créme and stire until melted. Add nuts and vanilla, mix well. Pour into foil lined 9' square pan. Spread evenly to cover the bottom of the pan. Cool at room temperature for about 12 hours. Cut into 1' squares.