Preheat oven to 350 degrees F. Pour oil into 8-inch baking dish and add ⅓ of zucchini, mozzarella cubes, parmesan cheese, salt to taste and parsley. Make layers in this manner until all ingredients are used. Cover with bread crumbs and dot with butter or margarine.
Bake uncovered at 350 degrees F. until golden brown, about 45 to 50 minutes.
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