Preheat your air fryer to 320°F. Line a sheet of parchment paper in your air fryer basket
Arrange a single layer of tortilla chips over the sheet, slightly overlapping them to prevent gaps (you want to support the toppings and prevent them from falling through).
Sprinkle half of the shredded cheese evenly over the chips, followed by the white parts of the onion.
Add another layer of tortilla chips on top of the cheese. Finish by topping with the remaining cheese, green parts of the onion, jalapeños and black olives, if desired.