Chicken Zucchini Casserole

6 oz boxed stuffing mix (such as Stove Top)
1/2 C butter melted
4-5 C of bite size pieces diced zucchini
3 boneless, skinless chicken breasts cooked and diced into small pieces
1/2 C shredded mozzarella cheese optional
10 1/2 oz canned cream of chicken soup
1/2 onion diced
1/2 C sour cream

Preheat oven to 350 degrees. In a large bowl, combine the stuffing mix and melted butter. Set aside 1/2 cup of the mixture for topping. Add zucchini, cooked chicken, Mozzarella cheese, cream of chicken soup, onion and sour cream to the stuffing in the large bowl. Spread zucchini mixture in an even layer in a 9 x 13-inch glass pan sprayed with nonstick cooking spray. Sprinkle reserved stuffing mix on top and bake, uncovered, for 40 to 50 minutes or until cooked through and the top is golden brown. If you would like to add more seasoning, you can use garlic powder, parmesan cheese, green onions, Italian seasoning, salt, and black pepper. If you don't have zucchini, you can use yellow squash instead.