• In a large saucepan, combine the water, mushrooms, broccoli and onion. Bring to a boil. Reduce heat; cover and simmer for 6-8 minutes or until vegetables are crisp-tender.
• Meanwhile, in a large bowl, combine the soup, Swiss cheese, mayonnaise, egg whites, egg, mustard, pepper and 3/4 cup cheddar cheese. Drain vegetables; stir into soup mixture.
• Transfer to an 11-in. x 7-in. baking dish coated with cooking spray. Sprinkle with potato chips and remaining cheddar cheese. Bake, uncovered, at 350° for 35-40 minutes or until a thermometer reads 160°.
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