Ingredients
makes enough for 12 jumbo cupcakes1 1/2 cups marshmallow cream, such as Marshmallow Fluff
1/2 cup (1 stick) unsalted butter, cut into pieces, room temperature
Whisk marshmallow cream and butter until smooth. Cover with plastic wrap, and chill until slightly firm, 15 to 30 minutes, before using.
Martha Stewart's Cupcakes