Preheat your air fryer to 300°F (150°C) for 5 minutes.

Peel the bananas and slice them into ⅛-inch-thick rounds.

In a small bowl, mix the sugar and ground cinnamon until well combined.

Gently toss the banana slices with the melted coconut oil or butter, ensuring each piece is lightly coated.

Sprinkle the cinnamon-sugar mixture over the coated banana slices, tossing gently to ensure even coverage.

Arrange the banana slices in a single layer in the air fryer basket, ensuring they do not overlap.

Air fry the banana slices for 15 minutes, flipping them halfway through the cooking time.

Once golden brown and crisp, remove the banana chips from the air fryer and transfer them to a wire rack to cool completely.