Place frozen hash browns is a 13 x 9 casserole dish lightly sprayed with cooking spray.
In a large bowl mix together the cheddar cheese, salt, pepper, peas and carrots, corn, sour cream, cream of chicken soup, milk and cooked shredded chicken; spoon mixture in a layer over the frozen hash browns.
Heat butter in a small saucepan until just melted – stir in corn flakes until well combined. Sprinkle corn flakes mixture over the casserole.
Bake for 1 hour-until hash browns are done and corn flakes are a golden brown.