I got this recipe years ago from the back of a marshmellow creme container. I have used it since for making fudge. It is easy and delicious.
Fantasy Fudge in the microwave
3/4 cup butter, 3 cups sugar, 5 oz. evaporated milk, 1 12 oz package chocolate chips (2 cups), 1 7 oz jar marshmellow cream, 1 tsp. van.
Microwave butter in 4 qt glass bowl on high 1 min. Add sugar and evaporated milk. Mix well. Microwave on high 3 min. Stir. Microwave on high 2 min. Stir. Microwave on high 3 min. Stir. Microwave on high 2 min. Stir. Remove from microwave, add chocolate chips. Stir until chips are melted. Add remaining ingredients. Mix well. Pour into greased 9 x 13 cake pan. Cool at room temperature. Cut into squares. Makes approx. 3 lb.
I use this same recipe for peanut butter fudge, vanilla, and butterscotch. Just substitute the chocolate chips with peanut butter chips or whatever type you are using. When making chocolate fudge, we prefer milk chocolate chips.