In a shallow bowl, combine all the marinade ingredients. Add the chicken breast strips to the bowl, cover with a lid, and marinate in the refrigerator for at least one hour. You can also let it marinate overnight.
While the chicken is marinating, slice the green bell pepper, red bell pepper, and onion into strips and set aside.
Remove the marinated chicken from the refrigerator. In a large skillet, add 1 tablespoon of oil and heat the skillet over medium heat. Cook the chicken strips for roughly 4 minutes on each side. Remove the cooked chicken from the skillet and set aside on a separate plate.
Add a splash of water to the skillet and scrape up any pan drippings leftover from the chicken.
Now add the bell peppers and onions to the skillet and sauté for 3-5 minutes.
While the bell peppers are cooking, wrap your tortilla shells in aluminum foil and warm them in the oven on a baking sheet at 325°F for 8 minutes or warm them in a damp paper towel in the microwave for 15-20 seconds.
Once the veggies are cooked to your liking, add the cooked chicken back to the skillet and turn your heat off. Garnish with fresh chopped cilantro and a fresh squeeze of lime juice.
Assemble your chicken fajitas with the bell peppers, onions and toppings of your choice. Enjoy!