ut 2 lengths of heavy duty foil approximately 18 inches square, placing one on top of the other for strength. Spray top one with non-stick spray. Spread potatoes on foil leaving plenty of room to fold up later. Scatter the onion over potatoes; slice the margarine over the potatoes; layer the Parmesan, mozzarella, and Cheddar cheeses over the potatoes; season with salt and pepper. Bring opposite edges of foil together and seal.
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