INGREDIENTS
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3 tablespoons olive oil
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1 pound large button mushrooms, stems and caps detached, stems finely chopped
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1 tablespoon unsalted butter
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1 teaspoon coarse salt
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2 cloves garlic
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1/4 teaspoon red-pepper flakes
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1/4 cup chopped flat-leaf parsley
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1 teaspoon lemon zest, plus juice of 1 lemon
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3/4 cup fresh breadcrumbs
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1/3 cup grated Parmesan, plus more for garnish
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2 egg whites