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To make straight, neat chips, peel the potatoes and trim away all the rounded edges so they become rectangular blocks. Cut the blocks into batons – they should be somewhere between fries and thick chips, as if they're too thin, they might break; too thick, and they won’t cook through (if you like, save the offcuts to make mash or add to soups). Alternatively, cut the unpeeled potatoes into chips without trimming, if you're not bothered by neatness. Rinse the chips and pat dry with a clean tea towel.
Tip the chips into the bottom of an air-fryer (the part with the paddle), add the oil, and toss the chips in the oil so they are evenly coated. Program the fryer to cook for 30 mins using the paddle. After this time, check that the chips are tender and cooked through. If they're not, cook for a further 5 mins. Season well.