Brush the melted coconut oil on the cut side of the bananas then sprinkle the sugar mixture all over the top until fully coated.
Lightly grease the rack or basket (depending on air fryer type) with cooking spray then place the bananas in the air fryer. If using an oven model air fryer, position the tray in the center of the air fryer.
Air fry the bananas at 400°F for 8-10 minutes until golden brown and caramelized.
Remove from the air fryer and serve warm with a scoop of vanilla ice cream and a dusting of cinnamon if desired.