Peel and slice the bananas into thin rounds, about ⅛ inch thick, ensuring even cuts for uniform cooking.

Combine the cinnamon and sugar in a small bowl.

Lightly coat the banana slices with melted butter or coconut oil, then sprinkle them evenly with the cinnamon-sugar mixture.

Set your air fryer to 350°F (175°C) and allow it to preheat for 3-5 minutes.

Arrange the banana slices in a single layer in the air fryer basket, avoiding overlap. Cook in batches if needed.

Air fry for 8-10 minutes, flipping halfway through, until the chips are golden and crispy. Keep an eye on them in the last few minutes to prevent burning.

Move the cooked banana chips to a wire rack to cool completely. They’ll crisp up as they cool.