Set your air fryer to 200°C (390°F) and allow it to warm up for about five minutes.
Prepare the air fryer basket by lining it with parchment paper to prevent sticking.
Pour the sugar into a small bowl, then coat each banana slice evenly by rolling it in the sugar.
Arrange the sugared banana slices neatly in the air fryer basket in a single layer.
Cook the bananas for 8 minutes, or until you notice the sugar bubbling and caramelizing around the edges.
Remove from the air fryer and serve immediately to enjoy the best flavor and texture.