Begin by slicing the chicken breast, bell peppers, and onion into evenly sized strips, about ¼-inch thick.

In a large mixing bowl, toss together the sliced chicken, bell peppers, and onions with a drizzle of oil and fajita seasoning.

Preheat your air fryer to 370°F (188°C) for about 5 minutes. Transfer the seasoned mixture into the air fryer basket and cook for 10 minutes, shaking halfway through.

Check the internal temperature of the chicken after 10 minutes. If needed, add an extra 3-5 minutes to reach 165°F (74°C).

While the fajitas are finishing, warm corn tortillas in a dry skillet over medium heat for about 30 seconds on each side. Fill each tortilla with the fajita mixture and garnish as desired.