Wash and dry the apples. You can choose to peel them or leave the skin on, depending on your preference. Apple skin adds extra fiber and nutrients.

Using a sharp knife or a mandoline slicer, thinly slice the apples into rounds. Aim for slices that are about 1/8-inch thick. To ensure even cooking, try to make the slices as uniform as possible.

In a large bowl, place the apple slices and sprinkle them with ground cinnamon. If you prefer sweeter chips, add a light dusting of granulated or brown sugar as well. Toss the apple slices gently to coat them evenly with the seasoning.

Preheat your air fryer to 350°F (175°C) for about 2-3 minutes. Preheating ensures even cooking.

Lay the seasoned apple slices in a single layer in the air fryer basket, making sure they are not overlapping. If desired, lightly spray them with cooking spray to enhance crispiness. Depending on the size of your air fryer, you may need to cook the chips in batches.

Cook the apple slices in the preheated air fryer for 8-12 minutes, flipping them halfway through the cooking time. Cooking times may vary depending on the thickness of your slices and the specific air fryer model. Keep a close eye on them to prevent burning; they should be golden brown and crispy.

Once your cinnamon apple chips are done, remove them from the air fryer and let them cool on a wire rack for a few minutes. They will continue to crisp up as they cool. Serve them as a delightful snack or garnish for various dishes.