Assemble quesadillas by spreading ¼ cup of refried beans over one quesadilla, top with ⅓ cup cheese, and ¼ of the bell peppers. Place the other tortilla on top.
Spray bottom with cooking spray and place in air fryer rack. IMPORTANT! Place a trivet or something to weigh down on the top half of the tortilla. I used one of the accessory racks that came with the Air Fryer accessory kit I bought. If you don't, the tortilla on top may fly up and get burnt to shreds. Luckily, when this happened to me, I recognized the burning smell and stopped the air fryer before anything catastrophic happened to me.
Cook quesadillas for 4 minutes, then flip, cook until golden brown and crispy on the outside and melty cheese on the inside! How do you flip? I used air fryer parchment liners that I could pull out easily iwth the quesadilla on them, then flip the whole thing, but it wasn't the easiest thing I've ever done!