Pick the right bananas: Choose firm bananas with a few green edges or just turning yellow. Overripe bananas get mushy and won’t crisp well.

Prep the air fryer: Preheat to 325°F (160°C) for 3–5 minutes. A warmed basket helps the slices start crisping right away.

Slice evenly: Peel and slice bananas into 1/8–1/4 inch rounds. Thinner slices turn crispier; thicker slices lean chewy. Use a sharp knife or mandoline for consistency.

Quick anti-browning bath (optional): Toss slices with 1–2 teaspoons of lemon or lime juice. This keeps their color brighter and adds a slight tang.

Light oil coat: Drizzle 1–2 teaspoons of oil over the slices and toss gently. You want a whisper-thin layer—too much oil can make them soggy.

Season: Sprinkle with a pinch of salt. Add cinnamon for warmth, Tajín for zesty heat, or a dusting of coconut sugar if you want a dessert vibe.

Arrange in a single layer: Place slices in the basket without overlapping. Crowding leads to steaming, not crisping. Work in batches if needed.

Air fry: Cook at 325°F (160°C) for 10–14 minutes, flipping halfway. Start checking around 9 minutes. They should turn golden around the edges.

Final crisp step: If they’re mostly there but still soft centers, reduce heat to 300°F (150°C) and cook 2–4 minutes more. Watch closely to prevent burning.

Cool to set: Transfer chips to a cooling rack or paper towel. They crisp fully as they cool for 5–10 minutes. Resist the urge to cover them while warm.

Taste and adjust: Sprinkle a tiny pinch more salt or spice while warm if needed. Serve once crisp.