This is the ultimate frosting...it is so fluffy and yummy, you'll just forget about the cake! My husband calls it "fluffyyummynutter" frosting!
In a small bowl, with mixer at low speed, combine Fluff, peanut butter and butter until blended.
Increase speed to medium; beat in icing sugar alternately with milk, adding just enough milk to make frosting spreadable; beat in vanilla.
(Makes enough to fill and frost two 8" OR 9" layers).
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