Prepare the Bananas:
Peel the bananas and slice them thinly (about 1/8 inch thick) using a sharp knife or a mandoline slicer for uniform slices.

Make the Cinnamon Sugar Mix:
In a small bowl, combine the granulated sugar, ground cinnamon, and a pinch of salt.

Coat the Banana Slices:
Brush or toss the banana slices lightly with the melted coconut oil to help the cinnamon sugar stick.

Sprinkle Cinnamon Sugar:
Evenly sprinkle the cinnamon sugar mixture over the banana slices, ensuring each slice is coated.

Air Fry the Chips:
Arrange the banana slices in a single layer in the air fryer basket, avoiding overlap. Air fry at 350°F (175°C) for 10-15 minutes, flipping halfway through, until the chips are golden brown and crisp.

Cool and Serve:
Let the banana chips cool completely to allow them to crisp up further before serving.