INGREDIENTS
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½ cup cup olive oil, plus more
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20 large cremini mushrooms, stems roughly chopped
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Kosher salt and freshly ground black pepper, to taste
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10 cloves garlic, chopped
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1 small shallot, chopped
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¼ cup dry sherry
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3 tbsp. chopped parsley
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2 tbsp. chopped sage
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1 egg white
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1¼ cups grated Gruyère
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½ cup panko