Carrot Stuffing Casserole

4 cup cooked sliced carrots
1 box Stove Top stuffing
1 small onion, chopped
1 cup sharp grated cheese
1 can cream of celery soup, thinned with 1 cup milk
Parmesan cheese

Cook carrots and onions, drain. Prepare stuffing following directions on the box. Butter casserole, layer carrots and onions, stuffing, then cheese. Pour soup over all layers. Sprinkle with Parmesan cheese, if desired. Bake at 350 degrees F for 25 minutes.