Preheat your oven to 350°F (175°C) and lightly grease a 9x13-inch baking dish.

In a large mixing bowl, combine the cooked shredded chicken, cream of chicken soup, sour cream, garlic powder, onion powder, black pepper, and shredded cheddar cheese. Stir until well blended.

Pour the mixture into the prepared baking dish and spread evenly.

In a separate bowl, crush the Ritz crackers and mix with melted butter until fully coated.

Sprinkle the cracker mixture over the chicken filling in the baking dish.

Bake uncovered for 25 to 30 minutes or until bubbly and golden brown.

Let the casserole rest for about 5 minutes before serving. Garnish with chopped parsley if desired.