Cook chicken. Reserve chicken broth and cook spaghettie noodles in the broth and drain. Saute onion and mushrooms in butter. Combine chicken, spaghetti, sauteed vegatables and remaining ingredients in a large sauce pan. Cook until cheese melts, stirring occasionally. Spoon into large baking dish. Top with parmesan cheese. Bake at 350 until bubbly.
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