Carefully slice one VitaTop in half lengthwise, so that you are left with 2 thin round "slices."
Evenly place 1/4th of the whipped topping on one slice. Top with 1/4th of the banana slices, followed by the other slice.
Repeat with the remaining VitaTops, whipped topping, and banana slices. Freeze them until solid, about 1 hour. So good!
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