Preheat your oven to 350°F (175°C).
In a large mixing bowl, combine the cooked egg noodles, shredded chicken, cream of chicken soup, sour cream, milk, garlic powder, onion powder, black pepper, and salt. Mix until well combined.
Pour the mixture into a greased 9x13-inch baking dish and spread it evenly.
In a separate bowl, mix the crushed crackers with the melted butter until the crackers are evenly coated.
Sprinkle the buttery cracker mixture evenly over the top of the casserole.
Bake in the preheated oven for 25-30 minutes, or until the casserole is hot and bubbly and the top is golden brown.
Remove from the oven and let it cool for 5-10 minutes before serving.