Wash and trim the asparagus by snapping or cutting off the woody ends.
In a large resealable plastic bag or mixing bowl, combine the trimmed asparagus, minced garlic, olive oil, lemon juice, salt, and black pepper. Toss until the asparagus is evenly coated.
Arrange the asparagus in a single layer in the air fryer basket or tray. Avoid overcrowding to ensure even cooking.
Set the air fryer to 400°F and cook the asparagus for 8 to 10 minutes, shaking the basket halfway through, until the asparagus is tender, crisp, and slightly browned.
Sprinkle the asparagus with grated Parmesan cheese, then cook for 1 additional minute to melt the cheese.
Serve immediately while hot.
Video
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Notes
Basket Air Fryers: Cook in a single layer at 400°F for 8–10 minutes, shaking the basket halfway through.
Toaster-Oven Style Air Fryers: Spread asparagus in a single layer on the tray. Rotate trays halfway through. Cook for 10 minutes, checking doneness at 8 minutes and adding 1–2 minutes if needed.
Combo Instant Pot Air Fryers: Arrange asparagus on the crisping rack. Start checking at 7 minutes; cook up to 1–2 minutes more if necessary.
Ovens with Air Fryer Settings: Use a wire rack over a baking sheet or the air fryer tray. Keep at 400°F. Cook for 10–12 minutes, rotating the tray halfway through.