2 cups unsalted butter
1 large container marshmallow Fluff
1 package (1 pound) sifted confectioner sugar (3 and 1/2 cups)
1 teaspoon “real” vanilla extract
1 Tablespoon Wilton Merange Powder (sold at Wal-Mart, Michaels, Hobby Lobby to name a few places)
In a large bowl, cream butter until light and fluffy (it should be a light yellow).
Add marshmallow fluff and beat 30 seconds.
Gradually beat in confectioner sugar and vanilla.
On medium high-speed, beat for 1 minute. (I beat longer)
Fill and frost cake.