Trim the green beans and mince the garlic if not already prepared. In a large bowl or sealable bag, combine the green beans, garlic, olive oil, salt, and black pepper. Toss until the green beans are evenly coated.
Arrange the green beans in a single layer on the air fryer tray or basket. If necessary, cook in batches to avoid overcrowding.
Set the air fryer to 400°F. Cook the green beans for 6–7 minutes, shaking the basket or tossing the beans halfway through to ensure even cooking.
While the green beans are roasting, zest the lemon and juice it.
When the green beans are tender and slightly crisp, remove them from the air fryer.
Drizzle the lemon juice over the cooked green beans. Sprinkle with lemon zest and Parmesan cheese. Serve immediately while hot and enjoy!
Notes
Basket Air Fryers: Cook in a single layer at 400°F for 6–7 minutes, shaking the basket halfway through.
Toaster-Oven Style Air Fryers: Spread green beans on the tray in a single layer. Rotate trays halfway through. Start with 7 minutes and adjust as needed.
Combo Instant Pot Air Fryers: Use the crisping rack and begin checking for doneness at the 5-minute mark. Cook up to 7 minutes if necessary.
Ovens with Air Fryer Settings: Use a wire rack over a baking sheet or the oven’s air fryer tray. Keep the temperature at 400°F. Cooking time may extend slightly; start checking at 7 minutes and cook up to 9 minutes.