1)Preheat oven to 400F
2)Wash and slice veggies about 1 inch thick.
3)Layer vegetables in a large casserole dish, starting with yams on the bottom, onions on top, then carrots, then zucchini, green peppers, mushrooms and broccoli.
4)In a separate bowl mix together ingredients for sauce and pour over vegetables.
5)Cover casserole dish, and cook for 45-60minutes. The yams should be easy to pierce with a fork when done.