Slice the chicken into bite-sized strips
Combine the marinade ingredients and lime shells into a large ziplock bag and shake everything up.
Add the chicken to the ziplock bag and refrigerate.
While the chicken is marinating, prepare the fajita seasoning mix.
Heat a 12" cast iron skillet with the avocado oil over medium heat.
Drain the chicken and add to the skillet once it's hot.
Sprinkle the fajita seasoning over the chicken and mix together.
Once the chicken is cooked and coated in a thick sauce, transfer it to a bowl. Wipe down the skillet and return to the element.
Add a tortilla to the skillet and portion out the chicken and shredded cheese. Fold the tortilla in half.
Cook for 2 minutes and flip. Cook for 1-2 minutes, remove from skillet. Repeat.