In 1 quart microwavable casserole, combine zucchini, onion, mushrooms, celery, and green pepper. Microwave on high 7-8 minutes until veggies are tender-crisp. Drain.
Place tostados on 12 inch glass dish, top with veggie mixture, sprinkle with cheese and salt. Microwave on high 2 minutes or until cheese is melted. Put sour cream on top and then top with tomatoes. Microwave 1 to 1 1/2 minutes or until heated. Serves 2-3.
By Sandy from Graettinger, IA
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