A wonderful way to serve zucchini for lunch or supper!
Combine zucchini, onion, mushrooms, and green pepper and salt.
Cover and simmer 8-10 minutes, until crisp tender.
Drain.
While above is cooking, heat tostados 5 minutes at 350*.
Put zucchini mixture on top of tostados; top with cheese.
Place in oven until cheese melts.
Top with sour cream, chopped tomatoes and taco sauce.
