Begin by slicing the chicken breasts into uniform strips—this ensures even cooking. Next, slice each bell pepper and the red onion into ½ inch strips.
Place the chicken strips, bell peppers, and onions in a large mixing bowl. Drizzle the canola oil over everything, then sprinkle the fajita seasoning evenly. Toss thoroughly to coat every piece.
Set your air fryer to 375°F (190°C) and preheat for about 3 minutes.
Transfer the seasoned chicken and vegetables to the air fryer basket in an even layer. Cook for 8 minutes, then toss with tongs or spatula. Continue cooking for another 6-8 minutes until chicken is cooked through and veggies are tender with slightly charred edges.
Remove the fajitas from the air fryer and transfer to a serving platter. Serve immediately with warm tortillas, rice, or your favorite toppings.
