Peel and slice the bananas into approximately 1/2-inch pieces using a sharp knife.
Place the banana slices into a clean mixing bowl.
In a separate microwave-safe bowl, melt the butter.
Whisk the brown sugar, cinnamon, and salt into the melted butter until well combined.
Pour the butter mixture over the banana slices and gently toss to coat them evenly.
Line your air fryer basket with a paper liner.
Carefully transfer the coated bananas into the prepared air fryer basket.
Air fry at 400 degrees F for 10-12 minutes, ensuring to stir halfway through the cooking time for even caramelization.
