Slice the zucchini into thin circles, boil in salted water until very tender, then drain thoroughly. Set aside. Meanwhile beat the eggs with the milk and seasonings, then add the parsley, cheese, onion, bread crumbs, and zucchini. Pour into a well butter 9x13” pan. Sprinkle top with butter bread crumbs and some Parmesan cheese. Bake at 350 for at least 1 hour or u til well browned and crusty around the edges.