To a large bowl, add the green beans, oil, garlic, onion powder, salt, and pepper. Using a large spoon, toss to coat the beans.
Place the green beans into the air fryer. Cook at 400°F for 16 minutes, stirring halfway through cook time.
Notes
Frozen green beans may be substituted for fresh string beans. Cook directly from frozen for 18 minutes, stirring halfway though cook time.To use canned green beans, set the air fryer temperature to 350ºF. Cook for 4 minutes, stirring halfway through cook time.