I have used this recipe for years and never had a flop. It makes a nice creamy fudge. It's found on the back of the Kraft Marshmallow Creme jar

Easy Fantasy Fudge

3/4 cup (1 1/2 sticks) margarine
3 cups sugar
1 can evaporated milk (5 oz.)
1 pkg. (12 oz.) Semi-sweet chocolate chips
1 jar (7 oz.) Kraft Marshmallow Creme
1 cup chopped nuts (optional)
1 tsp. vanilla

Lightly grease 13 x 9 inch pan.
Mix margarine, sugar and milk in heavy 2 1/2 or 3 quart saucepan; bring to fulling rolling boil on medium heat, stirring constantly. Continue boiling 5 minutes on medium heat or until candy thermometer reaches 234 degrees F.,stirring constantly to prevent scorching. Remove from heat. Gradually stir in chips until melted. Add remaining ingredients, mix well. Pour into prepared pan. Cool at room temp.; cut into squares. (Makes 3 lbs.)