Preheat oven to 350 degrees.
Mix together the cooked and shredded chicken, tortilla pieces, chopped peppers, spinach, black beans, tomato sauce, & garlic.
Place the mixture in a casserole dish and top with shredded cheese, crushed red pepper, and cilantro.
Bake for about 15-20 minutes or until hot.
Serve hot and enjoy, or place in containers for lunch the next day!