Best Zucchini Casserole

This is the best zucchini casserole I have ever eaten. I know summer is over but I'm sure you can still get zucchini.
Summer Zucchini Casserole

2 lbs sliced zucchini or summer squash
1/4 c sliced green onions
1 c grated carrots
1 tbsp butter
1 can cream of chicken soup
1/2 cup low fat sour cream
1 pkg chicken flavored stuffing mix

In a large bowl mix together soup, sour cream and stuffing mix.
In large frying pan melt the butter and add zucchini, onions and carrots. Saute until the zucchini is tender but not mushy.
Add the zucchini to the soup mixture and stir until all the ingredients and mixed together.
Spray a 9x13" baking pan with non stick spray. Add the zucchini to the baking pan and spread it out evenly in the pan.
Bake uncovered at 350 degrees for 30 minutes.