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Place six ice cream sandwiches on tray. Two up and three across.
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Cover top of layer with one half of the Cool Whip/pudding mixture.
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Layer six more ice cream sandwiches on top.
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Cover with the remaining Cool Whip/pudding mixture.
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Layer six more ice cream sandwiches on top for final layer.
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Cover entire cake with the second tub of cool whip.
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Place cake in freezer for an hour.
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Pipe buttercream around the edges (you can color the buttercream like I did). I just used a large zip top bag, cut one of the bottom corners and did a very simple straight piping. You can get fancier if you own tips and pastry bags.
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Add sprinkles.
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Cover and freeze until ready to serve.