Preheat your oven to 350°F (175°C). Lightly grease a 9x13 inch casserole dish.
In a large bowl, mix together green enchilada sauce, green chiles, cream of chicken soup, sour cream, milk, garlic powder, onion powder, salt, and pepper.
Stir in the uncooked rice and shredded chicken until well combined.
Spread the mixture evenly into the prepared casserole dish and top with shredded cheese.
Cover with foil and bake for 45 minutes, then uncover and bake for an additional 10-15 minutes until the cheese is bubbly and golden.
Let cool for a few minutes before serving. Garnish with chopped cilantro if desired.