Remove from heat, and mix in corn, black beans, and green chiles if using. To the casserole dish, add a thin layer of enchilada sauce then layer a few tortillas to cover the sauce.
For the final layer, top with the remaining tortillas, and pour the remaining enchilada sauce on the tortillas then finish off with 1 cup of shredded cheese and bake for 40 minutes.
Remove from the oven, and allow to set for at least 15 minutes before slicing and serving. Garnish with diced tomato, diced bell pepper, and fresh cilantro.