INGREDIENTS
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4 tablespoons butter, melted, divided
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4 tablespoons olive oil, divided, plus more for liberal drizzling
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4 to 5 medium potatoes, peeled and thinly sliced with a mandoline or the slicing side of box grater
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Salt and pepper
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1 1/2 to 2 cups coarsely grated stale white bread or peasant bread
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3/4 cup grated Parmigiano-Reggiano cheese
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1/4 cup flat-leaf parsley, chopped
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5 to 6 small, firm zucchini, thinly sliced or mandoline-sliced lengthwise
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1 medium onion, thinly sliced
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6 cloves garlic, thinly sliced
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4 small vine tomatoes
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2 tablespoons thyme, chopped