Chop lettuce, set aside. Slice (or dice) peppers, set aside. Grate cheese, set aside.
Skin and slice ripe avocado; dice tomato. Add avocado, garlic powder, diced tomato, sour cream, lime juice, and 2 tsp salt to a food processor and blend until smooth (or add to a large mixing bowl and stir with a fork). Set aside. You’ve got guacamole!
Mix mayonnaise, apple cider vinegar, and 1.5 tsp fajita seasoning in a bowl. Mix until blended together and set aside. You’ve got salad dressing!
Slice chicken into 1 inch cubes.
Add light oil to large pan and heat on medium-high heat. Add chicken and remaining 1.5 tsp fajita seasoning. Toss to coat.
Cook until chicken is slightly browned and remove from heat. Set aside.
If desired, add peppers to the same pan (without cleaning the remaining oil/seasoning mixture left over) and cook lightly. Diced peppers work best for this method. You can definitely leave them raw, though, and the dish tastes just as great!
Combine lettuce, peppers, cheese, and chicken. Serve and garnish with guacamole, salsa, and salad dressing.