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Place racks in the upper and lower thirds of your oven and preheat your oven to 200 degrees F. Line two baking sheets with parchment paper or a silpat mat.
Wash the apples. With an apple corer, very small cookie cutter, or the round side of a metal piping tip, core the apples (you can also skip this step if you don't mind a few seeds in the chips). With a mandolin (recommended) or a very sharp knife, slice the apples horizontally into 1/8 inch-thick rounds.
Arrange the apples in a single layer on the prepared baking sheets. Sprinkle with cinnamon. Bake for 1 hour in the upper and lower thirds of the oven. Remove the baking sheets and switch the pans' position on the upper and lower racks. Continue baking for 1 to 1 1/2 additional hours, until a single apple chip removed from the oven is crisp when set out at room temperature for 2 to 3 minutes (to test the apple chips, remove a single apple slice but let the others continue baking). Once you are happy with the crispness (the total time will vary based on the thickness of your slice and the type of apple), turn off the oven and let the apples sit in the oven for 1 hour as it cools down to crisp further (unless you fear you overcooked them, in which case remove the pan immediately and let it sit at room temperature).