Prepare the Chicken: Slice the chicken breasts into thin strips. In a bowl, mix the chicken strips with olive oil, chili powder, cumin, paprika, garlic powder, salt, and pepper until evenly coated.
Cook the Chicken: Heat a large skillet over medium-high heat. Add the seasoned chicken strips to the skillet and cook for 5-6 minutes, or until cooked through and nicely browned. Remove the chicken from the skillet and set aside.
Cook the Peppers and Onions: In the same skillet, add a little more olive oil if needed. Add the sliced bell peppers and onions to the skillet. Cook for 5-6 minutes, or until the vegetables are tender and slightly charred.
Assemble the Salad: Arrange the chopped lettuce on a large serving platter or individual plates. Top the lettuce with the cooked chicken, peppers, and onions. Add sliced avocado, cherry tomatoes, shredded cheese, and chopped cilantro on top.
Serve: Serve the Chicken Fajita Salad immediately with lime wedges on the side for squeezing over the salad. You can also offer salsa, sour cream, or your favorite dressing for topping.