How to Make Marshmallow Frosting
- Beat butter in a large bowl, until fluffy.
Beat in the confectioners' sugar, milk, and vanilla extract, until smooth.
Beat in marshmallow fluff until light and fluffy.
*Beat in coloring, if desired.
- Spoon into pastry bag with desired tip and top cupcakes, add sprinkles, and let it sit for 15 minutes.