INGREDIENTS
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8 ounces coarsely chopped peeled Yukon gold potato
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4 ounces sliced cremini mushrooms
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4 ounces sliced button mushrooms
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1/2 cup chopped leek
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1 teaspoon chopped fresh thyme
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Cooking spray
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1/2 cup (2 ounces) shredded Gruyere cheese
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1/4 cup (1 ounce) grated Parmigiano-Reggiano cheese, divided
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1/2 teaspoon kosher salt
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1/2 teaspoon freshly ground black pepper
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1 large egg yolk
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1/3 cup all-purpose flour
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1 large egg white
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2 teaspoons water
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1/2 cup panko (Japanese breadcrumbs)
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1 tablespoon olive oil