Preheat air fryer to 400 degrees. In a large bowl, add onion, olive oil, and salt and pepper (I like at least 1/2 teaspoon salt and 1/4 teaspoon pepper). Toss to combine. Transfer the onion to the basket of an air fryer and arrange in a single layer (work in batches if necessary).
Air fry at 400 degrees until the onions are softened with caramelized edges, about 8 to 10 minutes. Season to taste with salt and freshly ground black pepper.
Notes
Onion: This recipe works for brown, red, yellow, or white onions. Cut into evenly-sized pieces to ensure even cooking
Yield: This Air Fryer Onions recipe makes about 1 c., enough for four 1/4-c. servings.
Storage: Store leftovers in an airtight container in the refrigerator for up to 4 days.