I did this initially when I ran out of fresh potatoes, and it worked really well. Place the chips in a saucepan of water, and boil as you would potato that you'd just peeled and cut up. The oily coating on the chips dissolves in the boiling water, and is poured away when you strain them.
It sounds extravagant, but I got 2.5kg (5.5lb) for £0.99, which doesn't compare badly with raw potatoes, once you allow for the loss of peelings, eyes and any bruised bits. And it's a timesaver. Don't attempt to do this with batter coated chips like Aunt Bessie's - and do be aware that the chips will retain slightly more moisture than cooked raw potatoes, and adjust any added ingredients accordingly.
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Brown hamburger; melt cheese into hamburger. Place hamburger-cheese mixture in the bottom of 9x13 inch dish. Place frozen French fries on top of hamburger and bake as directed on the back of the French fry bag.
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Fill their stomachs on this frugal tasty salad while they wait for the main course and I guarantee no one will come back for seconds. Place hot french fries (store bought or sliced potatoes) over a bed of lettuce with a biscuit or slice of toast on the side, topped with your favorite dressing or a splash of your own home blended dressing, salt and pepper to taste.