Slice the bananas into 1/4-inch thick slices. Transfer them to a bowl.
Drizzle with olive oil and mix well. Dip each banana slice in the lemon juice mixture, ensuring both sides are coated.
Place the banana slices in a single layer in the air fryer basket. Air fry for 20 minutes, flip, and cook for a further 10-15 minutes.
Let them dry out completely until crispy.
Notes
Oil-free: While these will work without the oil, they will be brown in color.
Oven option: Preheat the oven to 200°F (100°C) and line a baking sheet with parchment paper. Prepare the banana slices, then bake them for 1 ½-2 hours, flipping them halfway through.
Leftovers: Leftover chips can be stored in an airtight container at room temperature for up to three weeks.