Preheat oven to 375°F (190°C). Lightly grease a 9x13 inch baking dish.
Cook egg noodles according to package instructions. Drain and set aside.
In a large mixing bowl, combine cream of chicken soup, sour cream, milk, garlic powder, onion powder, salt, and pepper. Stir until smooth.
Add the shredded chicken, cooked noodles, frozen peas and carrots, and 1 cup of the cheddar cheese. Stir to combine.
Spread the mixture evenly into the prepared baking dish.
Sprinkle remaining 1/2 cup cheddar cheese over the top.
In a small bowl, mix the breadcrumbs with melted butter. Sprinkle evenly over the casserole.
Bake uncovered for 25–30 minutes or until bubbly and golden on top.
Let sit for 5 minutes before serving. Garnish with chopped parsley if desired.