Chicken Enchilada Casserole

2 cans cream of chicken soup
2 cups milk or 1 cup milk & 1 cup sour cream
1 can (4oz) chopped green chilies
1/2 cup chopped onion
1 can corn
12 oz can chicken
12 tortillas (approx)
Cheddar cheese

Heat together the cream of chicken soup and milk/sour cream in a saucepan.  Add the green chilies, onion, corn, and chicken.  Layer in a 9x13 pan the sauce, tortillas, and cheese several times, ending with sauce and cheese on top.  Bake at 350 degrees for 30-40 minutes.