Preheat the air fryer to 212°F while you prepare the bananas.

Peel the bananas and slice them into thin, even rounds about the thickness of a coin.

Place the banana slices in a bowl and gently toss with the lemon juice to coat.

Lightly spray the base of the air fryer basket with spray oil.

Lay the banana slices in a single layer directly on the base of the basket, leaving a little space between slices.

Air fry at 212°F for 40 minutes, checking halfway through.

At the halfway mark, gently loosen any slices that are sticking to the basket with a thin spatula or tongs and give the basket a light shake.

Continue cooking until the banana slices look dry, have lightly golden edges, and feel firm.

Remove the banana chips from the air fryer and transfer them to a cooling rack in a single layer.

Immediately sprinkle the warm chips with a pinch of salt and let them cool completely to finish crisping.

Repeat the cooking process with any remaining banana slices, if needed, and cool all chips fully before serving or storing.