Grease foil lined 9x13 pan & set aside

premix peanut butter, fluff, vanilla & flour (beat with electric mixer) Set aside while you boil the ingredients below

In saucepan, combine sugar, milk & butter. Bring to a rolling boil (stirring constantly) Start your timer for 5 1/2 minutes from the time the mix starts boiling. Continue to stir while it's boiling.

As soon as timer goes off, pour mix into bowl with peanut butter mixture & blend together immediately & quickly. (use the electric mixer)

Once everything is blended smoothly, pour quickly into prepared pan & let cool for several hours.