Preheat your air fryer to 400°F (200°C).
Wash the asparagus thoroughly and trim the tough ends.
In a bowl, toss the asparagus with olive oil.
Sprinkle garlic powder, salt, and pepper over the asparagus.
Mix well until evenly coated.
Place the asparagus in the air fryer basket in a single layer.
Air fry for 8-10 minutes, shaking halfway through.
Check for desired tenderness; cook longer if needed.
Remove asparagus from the air fryer and sprinkle with Parmesan cheese if desired.
Serve immediately and enjoy!