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Preheat oven to 200°F (93ºC).
Line two large baking sheets with parchment paper or a silicone baking mat.
Sift powdered sugar into a bowl. Add cinnamon to the powdered sugar and gently whisk to combine.
Thinly slice the apples using a mandoline, to 1/16-inch. Remove the seeds from the individual slices.
Spread the apple slices onto the lined baking sheets making one single layer. About 15 slices should fit on a half sheet pan.
Transfer the cinnamon and sugar mixture into a sifter or strainer. Gently sprinkle each apple slice with a thin coating of the cinnamon sugar mixture.
Turn the apple slices over and sprinkle with the remaining cinnamon-sugar.
Bake for 1 hour, then flip and bake until crisp, an additional 1 hour.
To test the doneness, remove the apples from the oven and allow to rest at room temperature for 5 minutes. If the apples are not crunchy, continue baking in 15-minute increments.
Remove the apples from the baking sheets and allow to cool completely before storing in an airtight container.