Cook spaghetti according to directions.
In large saucepan, saute mushrooms and onions in butter until tender. Stir in soup and water. Stir and cook until blended. Stir in spaghetti and and all other ingredients except parmesan and paprika.
Turn into a 13X9x2 baking dish. Top with parmesan and paprika. Bake at 375 for 45 minutes or until heated through.
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