Pre-heat the air fryer at 400ºF.
Place chicken, peppers and onions into a mixing bowl, coat with 4 tablespoons oil and season with 4 tablespoons of fajita seasoning. Add the fajitas to the air fryer basket without over filling. You can crowd the basket but don’t pile the fajitas too, you can cook in batches.
Cook each batch for 10 minutes.
Remove and let rest for a couple of minutes.
Warm the tortillas and add a spread of sour cream. Add the fajitas, and top with cheese and cilantro.
Enjoy!