Add the chicken thighs and marinade to a resealable bag or container and marinate for 2- 3 hours (and no longer than 12 hours).
Once ready to cook, preheat an air fryer at 400ºF for 5 minutes while you prepare the vegetables.
Remove the chicken from the marinade, keeping any run off in the container, and place in the air fryer basket. Cook for 12-14 minutes at 400ºF or until the chicken reaches an internal temperature of 165ºF.
Once the chicken is cooking, add the veggies to the remaining marinade and shake or stir to coat. Set aside.
Once the chicken is cooked, transfer out of the air fryer and set aside to rest.
Cook the veggies for 12-15 minutes at 400ºF, shaking halfway through until the onions are soft and starting to brown around the edges and the peppers are tender crisp.
Slice the chicken and add back to the air fryer basket with the veggies. Toss everything together and air fry another minute or two at a lower heat to reheat, if needed. Serve with warmed tortillas and your choice of condiments.