Break the ends off the asparagus stalks, about 1/2 inch.
Put the asparagus in a deep bowl, salt and pepper, and brush with olive oil.
Grease the air fryer grate with extra olive oil. Add the asparagus and roast for 7 minutes, shaking halfway through.
After 7 minutes, sprinkle the asparagus with parmesan and fry for another 3 minutes.
Serve asparagus immediately after frying. Before serving, you can sprinkle it with lemon juice.