In a large skillet over medium heat, cook the sausage, onion, celery and mushrooms in oil until meat is no longer pink; drain if necessary. In a large bowl, combine the remaining ingredients; add sausage mixture and toss to coat.
Transfer to a greased 11-in. x 7-in. baking dish. Cover and bake at 350° for 30 minutes. Uncover; bake 10-15 minutes longer or until lightly browned.
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