The first way that you can serve this Chicken Fajita Casserole is in a bowl with toppings.  It truly is a meal in itself {especially with the addition of white rice}.  Some sour cream, cilantro, salsa and avocado slices are all wonderful on top. You can also serve this Fajita Casserole with corn tortillas or flour tortillas, just like you would traditional fajitas.  Layout your favorite toppings and let everyone build their fajitas to their liking.