Brown sausage in a skillet, stirring until it crumbles; drain well and set aside. In a large skillet over medium heat, sauté zucchini and onion in butter until tender. Combine zucchini mixture, sausage, corn, cheese, stuffing and chiles; stir well. Spoon into a lightly greased 2-quart casserole dish. Bake, uncovered, at 350 degrees for 40 minutes, or until golden and bubbly.