Chicken Noodle Casserole

Name: Chicken Noodle Casserole
Prep time: 20 min
Cook time: 35 min
Total time: 55 min
Cuisine: American
Ingredients: 2 (12.5 ounce) cans chunk chicken breast, drained ((or about 3 cups of store-bought rotisserie chicken, diced)); 2 (10.5 ounce) cans cream of chicken soup; 1 cup mayonnaise; 1 cup milk; 1/2 onion, finely diced (optional) ((you could also use about 1 Tablespoon of dried onion flakes - see notes below)); 2 cups shredded cheddar cheese; 1 1/2 cups frozen peas and carrots; 12 ounce package egg noodles, cooked and drained; 1 cup panko bread crumbs; 1 stick salted butter (1/2 cup), melted