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Heat oven to 200C/180C fan/gas 6. Boil the potatoes for 10-12 mins or until half-cooked. Drain.
Meanwhile, heat a little oil in a large non-stick frying pan. Brown the mince in 2 batches, breaking up any lumps with the back of a wooden spoon. Tip all the mince back into the pan, add the cinnamon and fry for 1 min. Pour in the tomato sauce and simmer for 5 mins. Slice the potatoes as thinly as you can without breaking the slices.
Layer the mince and potatoes in a 1.5-litre baking dish. Season each layer and finish with a layer of potatoes. Spread the cheese or white sauce on top and bake for 35 mins until golden and the potatoes are tender.