Cook the egg noodles according to the package instructions. Be sure not to overcook them; al dente is best. Drain and set aside.
In a large bowl, combine the cooked egg noodles, chopped chicken, cream of chicken soup, milk, mixed vegetables, shredded cheddar cheese, salt, and pepper. Mix well until everything is evenly coated.
Pour the mixture into a greased 9x13-inch baking dish. Make sure to spread it out evenly for even cooking.
In a small bowl, mix the breadcrumbs and melted unsalted butter. This adds a nice crunch to the top of your casserole. Sprinkle this mixture over the casserole.
Bake for 20 minutes or until the casserole is warm and bubbly. You'll know it's ready when the edges are gently bubbling.
Allow the casserole to cool for 5-10 minutes before serving. This also helps the flavors meld together. Enjoy!
Notes
Feel free to customize this casserole by adding your favorite herbs or spices for extra flavor.