Preparation:
Preheat oven to 375°F.
Spray a 9×13-inch baking dish with nonstick spray.
Bring a large pot of salted water to a boil.
Cook egg noodles according to package directions (about 8 minutes for al dente). Drain well and set aside.
Making the Casserole:
In a large mixing bowl, combine shredded chicken, thawed peas and carrots, thawed corn, cream of chicken soup, cream of mushroom soup, milk, melted butter, dried minced onion, garlic powder, Italian seasoning, salt, and pepper.
Stir everything together gently but thoroughly until well combined.
Add the cooked egg noodles and fold them in carefully to avoid breaking them.
Pour the entire mixture into the prepared baking dish and spread evenly with a spatula.
Cover the dish tightly with aluminum foil.
Baking:
Bake for 30 minutes, or until heated through completely and edges are bubbling.
Remove from oven and let stand for 5 minutes before serving.