INGREDIENTS
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½ cup canned chopped tomatoes with juice
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¼ cup olive oil, plus more for coating baking dish
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1 medium yellow onion, finely chopped (about ½ cup)
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2 garlic cloves, finely chopped
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3 medium zucchini (about 1 ¼ pounds), rinsed and finely diced
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1 tablespoon chopped fresh basil
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1 tablespoon chopped fresh flat leaf parsley
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1½ teaspoons salt
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¾ teaspoon freshly ground black pepper
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½ cup dry bread crumbs
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½ cup freshly grated Parmigiano-Reggiano
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1 egg, lightly beaten
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24 jumbo white mushrooms (about 1 pound), rinsed and patted dry