Prepare a bowl with 2 cups of water and 1/2 cup lemon juice. Slice bananas evenly and add to bowl. Allow to soak for 5 minutes.

Arrange banana slices in a single layer on a baking sheet lined with parchment paper. If using the oven, preheat to 200°F (93°C).

Bake for 2 hours, flipping the chips after 1 hour, or until dry. For microwave, place in a single layer on a microwave-safe plate and microwave for 1 minute. Flip chips and microwave for another minute, waiting 30 seconds in between intervals until desired crispness is reached.

For air fryer, preheat to 360°F (182°C). Spray the rack with non-stick spray. Layer chips in a single layer and fry for 12 minutes. Check and fry an additional 3 minutes if not yet crisp.

Allow chips to cool completely to crisp up.