Preheat your oven to 350°F (175°C).
In a large mixing bowl, combine the shredded chicken, cream of chicken soup, sour cream, and milk.
Stir in garlic powder, onion powder, salt, and pepper until well mixed.
Add the shredded cheddar cheese and mix thoroughly.
Pour the chicken mixture into a greased 9x13-inch baking dish.
In a separate bowl, combine crushed Ritz crackers with melted butter.
Sprinkle buttered Ritz crackers evenly over the chicken mixture.
Bake in the preheated oven for 25-30 minutes, or until bubbly and golden brown.
Let the casserole cool for a few minutes before serving.
Garnish with fresh parsley if desired.