Prep your veggies: Begin by washing and slicing your bell peppers and onion into thin strips, ensuring they're ready to mingle in the air fryer. Then, cut the chicken into bite-sized pieces.

Marinate the chicken: In a large bowl, toss the chicken pieces with olive oil, fajita seasoning, salt, and pepper until they are well coated. Allow the mixture to marinate for about 10 minutes for the flavors to penetrate.

Preheat the air fryer: Set your air fryer to 400°F (200°C). While it's heating up, place the seasoned chicken in the basket along with the sliced vegetables. Cook everything for 12-15 minutes until cooked through and slightly charred.

Add lime juice: Once cooked, remove the mixture from the air fryer and squeeze fresh lime juice over the contents. Toss well to combine.

Warm the tortillas: In a dry pan over medium heat, warm your tortillas for about 30 seconds per side until soft and pliable.

Assemble and enjoy: Fill each warm tortilla with the chicken and vegetable mixture, garnishing with chopped cilantro if desired.