Chicken Zucchini Casserole

In a large bowl, combine stuffing mix and butter. Set aside 1/2 cup for topping. Add the zucchini, chicken, soup, carrot, onion and sour cream to the remaining stuffing mixture. , Transfer to a greased 11x7-in. baking dish. Sprinkle with reserved stuffing mixture. Bake, uncovered, at 350° until golden brown and bubbly, 40-45 minutes.