Peel bananas and slice into uniform 1/8-inch thick rounds using a mandoline or sharp knife.

In a mixing bowl, whisk together the melted coconut oil, sugar, cinnamon, and salt.

Gently toss the banana slices in the mixture until each piece is evenly coated.

Preheat the air fryer to 300°F (150°C).

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

Air fry for 10 minutes, then flip each slice using tongs and cook for an additional 8 to 10 minutes until golden brown.

Transfer the chips to a wire cooling rack for at least 5 minutes; they will continue to harden and crisp as they cool.