Preheat oven to 225 degrees F (110 degrees C).
Arrange apples slices on a metal baking sheet.
Mix sugar and cinnamon together in a bowl; sprinkle over apple slices.
Bake in the preheated until apples are dried and edges curl up, 45 minutes to 1 hour. Transfer apple chips, using a metal spatula, to a wire rack until cooled and crispy.
Slice apples using the slicing blade of a food processor or a mandoline.
If you want, flip apple slices halfway through baking and sprinkle the other side with cinnamon sugar. Note: they will not feel crispy until they cool down.
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