INGREDIENTS
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3 pounds russet potatoes, peeled and cubed
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8 ounces sour cream (or Greek yogurt)
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1/2 cup whole or 2% milk, plus more as needed
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8 ounces sharp cheddar cheese, grated (about 2 1/2 cups)
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2 large shallots, minced (about 1/2 cup)
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2 teaspoons kosher salt
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Freshly ground black pepper, to taste
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1/4 cup grated Parmesan cheese