Whisk all of the fajita marinade ingredients together in a large bowl.
Add sliced chicken and marinate at least 5 minutes. A minimum of 30 minutes is preferred. Marinate overnight in the refrigerator, covered, for more developed flavor.
Heat a large cast iron pan to medium heat and add olive oil.
Add the chicken and cook for 4-5 minutes per side, or until the chicken is cooked through. Remove the chicken and set aside.
Add more oil to the pan if needed and add the peppers and onions. Cook for 7-8 minutes, stirring here and there, until the peppers and onions are cooked to your preference.
Return the chicken to the pan and heat through. Remove from heat.
Squeeze on fresh lime juice, then serve on warmed tortillas and top with your favorite toppings. Enjoy!
