Preheat the air fryer to 375°F (190°C) for 5 minutes.
Slice the chicken breasts into thin strips.
In a bowl, toss the chicken strips with olive oil, chili powder, smoked paprika, cumin, and garlic powder until evenly coated.
Add the chicken strips to the air fryer basket in a single layer and cook for 8 minutes.
Shake the basket, add the sliced bell peppers and onions, and cook for an additional 7 minutes until chicken is cooked through and vegetables are tender.
Warm tortillas in a dry skillet or microwave.
Serve the chicken and vegetable mixture on warm tortillas and enjoy your quick fajitas.
Notes
For extra heat, add sliced jalapeños or a dash of hot sauce to your fajitas.