Preheat the air fryer to 400°F (200°C) for 3 minutes if your model recommends preheating.Wash and trim the tough ends from the asparagus.Place the asparagus in a mixing bowl and toss with olive oil, garlic powder, salt, black pepper, and Parmesan cheese.Arrange the asparagus in a single layer in the air fryer basket.Air fry at 400°F (200°C) for 6–8 minutes, depending on the thickness of the asparagus, shaking the basket halfway through.Remove from the air fryer and let rest for 2 minutes.Sprinkle with lemon zest if desired and serve immediately with lemon wedges.