01 -
Preheat your oven to 350°F (175°C) to prepare it for baking.
02 -
In a large mixing bowl, combine the shredded chicken with the cream of chicken soup, cream of mushroom soup, sour cream, mayonnaise, garlic powder, onion powder, salt, and pepper. Mix until well combined.
03 -
Fold in the cooked egg noodles and diced tomatoes, if using. Mix gently to avoid breaking the noodles.
04 -
Spread the chicken mixture evenly into a greased 9×13 inch baking dish to ensure an even bake.
05 -
Sprinkle the shredded cheddar cheese evenly across the top of the chicken mixture.
06 -
In a small bowl, mix the crushed cornflakes with melted butter until coated. Distribute the mixture evenly over the cheese layer.
07 -
Place the dish in the preheated oven and bake for 30-35 minutes, until hot and bubbly with a golden-brown topping.
08 -
Let the casserole cool for a few minutes after removing it from the oven. Serve and enjoy.