2-3 med. zucchini, sliced 1/4 inch thick
1 sm. onion, chopped
1 med. jar Ragu spaghetti sauce with mushrooms
Parmesan cheese

Mix zucchini, onion and spaghetti sauce together. Pour mixture in a buttered casserole dish. Bake at 350 degrees for 45 minutes. Sprinkle top with Parmesan cheese and bake 10 minutes longer.