Preheat your air fryer to 300°F (150°C) for 5 minutes.
Peel the bananas and slice into thin ⅛-inch rounds.
In a small bowl, mix the sugar and cinnamon.
Toss banana slices gently with melted coconut oil or butter.
Sprinkle the cinnamon sugar mixture over the slices and toss evenly.
Arrange the slices in a single layer in the air fryer basket.
Air fry for 15 minutes, flipping halfway through.
Remove and let cool on a wire rack until crisp.
These Cinnamon Sugar Air Fryer Banana Chips will crisp up further as they cool, giving you the perfect crunchy texture.