Slice the Bananas: Start by peeling your firm, slightly underripe bananas and slicing them into uniform thin rounds of about 1/8 inch thick.

Preheat Air Fryer: Set your air fryer to preheat at 330°F (165°C). Lightly spray the basket with cooking oil or line it with parchment paper.

Mix Cinnamon and Sugar: In a small bowl, combine the coconut or brown sugar with the ground cinnamon and stir until well mixed.

Coat Banana Slices: Toss the banana slices in the cinnamon-sugar mixture until lightly coated on all sides.

Air Fry in Batches: Place a single layer of coated banana slices into the air fryer basket. Air fry for about 10-14 minutes, flipping halfway through.

Check for Crispness: Keep an eye on your banana chips; they are ready when golden brown and crispy. Add an extra 2-3 minutes if needed.

Cool and Crisp: Carefully transfer them to a wire rack to cool for 5-10 minutes before enjoying.