1 cup butter, softened
1 jar (7 to 8-oz) marshmallow cream
1 cup powdered sugar
1 tsp vanilla extract
food coloring, if desired
In medium to large mixer bowl, beat the butter on medium speed until creamy; beat in the marshmallow cream until well blended. Beat in the powdered sugar and vanilla extract. Turn mixer speed to high and beat until fluffy (about 3 to 4 minutes). Beat in a few drops of desired food color if you wish to have tinted frosting.