Preheat your oven to 400°F and lightly grease a 9×13-inch baking dish.
Spread the frozen hashbrowns evenly across the bottom of the prepared baking dish.
In a large mixing bowl, combine the shredded cheddar cheese, peas and carrots, sour cream, drained corn, cream of chicken soup, shredded chicken, milk, and salt and pepper. Mix until all ingredients are well incorporated.
Pour the mixture evenly over the hashbrowns, spreading it into an even layer.
Sprinkle the bread crumbs evenly over the top of the casserole.
Bake in the preheated oven for 1 hour, or until the top is golden brown and the casserole is heated through.
Remove from the oven and let it sit for a few minutes before serving. Enjoy warm!
Enjoy!