Preheat your oven to 350°F (175°C) and set aside a 9×9-inch baking dish.
Break down the cooked chicken into shreds or bite-sized pieces and set aside.
In a large mixing bowl, stir together the softened cream cheese, cottage cheese, sour cream, condensed cream of chicken soup, garlic powder, and onion powder until the mixture becomes smooth and uniform.
Fold the shredded chicken into the creamy mixture until every piece is well-coated. Spread the filling evenly into the prepared baking dish.
In a separate bowl, crush the sleeve of buttery crackers into coarse crumbs. Drizzle the melted butter over the cracker pieces and toss until thoroughly coated.
Evenly scatter the buttered cracker topping over the surface of the casserole.
Place the dish uncovered into the preheated oven and bake for approximately 40 minutes, or until bubbling and lightly browned on top. Optionally, garnish with freshly chopped parsley before serving.