Directions:
   Boil the zucchini and onion for 5 mins. Drain. Mix in soup, sour cream, raw carrot, and parmesan cheese. Set aside. Melt butter and mix with dressing. Put half dressing in bottom of 13x9x2 casserole pan. Put zucchini mixture over dressing. Put other half of dressing over zucchini mixture, Sprinkle with shredded colby or cheddar cheese. Bake at 350 degrees for 30 mins.

I've made this and taken it to pot luck dinners. It has always been a hit.