Wash and dry the asparagus thoroughly.
Trim ½ to 1 inch off the ends of the spears.
Preheat the air fryer to 400°F (204°C) if needed.
Toss the asparagus with olive oil until lightly coated.
Arrange on parchment paper and sprinkle with garlic powder, black pepper, and parmesan cheese.
Transfer to the air fryer basket in a single layer.
Air fry for 4–6 minutes, depending on thickness.
Remove once the asparagus is bright green and the cheese is golden.
This air fryer asparagus parmesan is best served immediately while warm and crispy.