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2 pounds russet potatoes, peeled and grated |
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2 medium zucchini, grated |
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1 teaspoon chopped fresh rosemary leaves, plus leaves, for garnish |
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1/4 cup grated Parmesan, plus 1 tablespoon |
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1/4 cup seasoned bread crumbs |
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2 egg whites, lightly beaten |
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2 teaspoons kosher salt, plus extra for seasoning |
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1/4 teaspoon freshly ground black pepper, plus extra for seasoning |
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3 tablespoons vegetable oil |
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1 1/2 cups mascarpone cheese, at room temperature |
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