Evenly slice apple into ⅛th inch thick slices. Remove any seeds. Place in a single layer on a flat surface. Set aside.
In a small bowl, combine sugar and cinnamon.
Sprinkle apple slices with cinnamon sugar mixture on both sides. Lightly spray air fryer basket.
Add slices in air fryer basket, trying not to pile them on top of each other too much.
Set air fryer to 300°F. Air fry for 15 minutes, tossing apple slices every 5 minutes (and more often towards the end of the cooking time), until golden brown and almost crispy.
Set apple chips on a cooling rack to cool completely. Chips will continue to crisp up even more as they cool.
Serve immediately.
