Easy Chicken-Chilies Casserole
["8 (10 inch) flour tortillas", "2 c. cooked chicken, cut in bite-size pieces", "1 can (10 3/4 oz.) cream of chicken soup", "1 carton (8 oz.) sour cream", "1/2 c. finely chopped onion", "1 can (4.5 oz.) green chiles, chopped", "3 c. (12 oz.) shredded cheese - cheddar, taco-seasoned, or combined cheddar and Monterey Jack", "Optional toppings: shredded lettuce, chopped tomato and salsa"]
["Preheat oven to 350\u00b0F.", "Lightly coat 13 x 9 inch baking dish with non - stick cooking spray."]
["flour tortillas", "chicken", "cream of chicken soup", "sour cream", "onion", "green chiles", "shredded cheese - cheddar", "toppings"]