01 - Preheat the air fryer to 350°F for 3 minutes.
02 - Peel the bananas and slice each into 1/8-inch thick coins using a sharp knife or mandoline.
03 - Place banana slices in a medium mixing bowl and gently toss with melted coconut oil to ensure even coverage.
04 - Combine granulated sugar, ground cinnamon, and a pinch of salt in a small bowl.
05 - Add half of the cinnamon sugar mixture to the bananas and toss gently to coat.
06 - Arrange the banana slices in a single layer in the air fryer basket without overlapping. Air fry in batches if necessary.
07 - Cook at 350°F for 12 to 15 minutes, flipping slices halfway through, until golden and crisp. Monitor closely to avoid overbrowning as air fryer performance may vary.
08 - While still warm, gently toss chips with the remaining cinnamon sugar mixture.
09 - Allow banana chips to cool completely to maximize crispiness before serving.