That was quick , a friend that visits here also read my post and emailed me
Here is was she sent.
1 stick (1/2 cup) unsalted butter, softened
11/4 cups confectioners sugar
2 cups marshmallow cream such as Marshmallow Fluff
1 teaspoon vanilla
Beat together butter, confectioners sugar, marshmallow, and vanilla in a bowl with electric mixer at medium speed until smooth, about 3 minutes
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