In a large skillet saute the summer squash, zucchini,m mushrooms and onion in oil until tender, drain. In large bowl, combine the vegetable mixture, cheese, soup, sour cream and salt. Transfer to a greased 11x7 baking dish. Combine cracker crumbs and butter, sprinkle over vegetable mixture. Bake uncovered at 350 for 25-30 minutes.
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