Chicken zucchini casserole

Ingredients
6 ounces boxed stuffing mix (such as Stove Top)
½ cup butter melted
4 diced zucchini (about 4-5 cups)
3 boneless, skinless chicken breasts cooked and diced
10 ½ ounces canned cream of chicken soup
½ onion diced
½ cup sour cream
Instructions
Preheat oven to 350 degrees F.
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, 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 40-50 minutes or until cooked through and the top is golden brown.