Lay the four sections of the Arnold sandwich thins rolls on a flat surface.
Top each piece of bread with some of the pizza sauce.
Sprinkle on the parmesan and mozzarella cheeses.
Top the mini pizzas with pepperoni slices, red onion and green bell pepper.
Place the mini pizzas in the tray of the air fryer, and cook at 400 degrees for 5-10 minutes, or until the cheese is melted and the pizzas are done to your liking.