In a large skillet, saute zucchini in 2 tablespoons butter until crisp-tender; drain well. In a bowl, combine the remaining ingredients. Stir in the zucchini and remaining butter. Transfer to an ungreased 2-qt. baking dish. Bake, uncovered, at 350° for 25-30 minutes or until bubbly. Let stand for 10 minutes before serving.