This is a great frosting if you love marshmallow ! I would suggest making a double batch when you frost a cake cuz you will be tempted to eat some .
1 cup butter, softened
1 (7-ounce) jar marshmallow crème
2 cups powdered sugar
1 teaspoon vanilla
Cream the butter until it is light and fluffy. Add the marshmallow crème and beat for about two minutes. Slowly add the powdered sugar and beat for an additional two minutes. Add the vanilla extract and mix until combined.
Frost your favorite cake when cake is cooled.