"These decadent potatoes boast a golden-brown crust and a rich, creamy, extra-cheesy center...."
INGREDIENTS
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Butter or cooking spray, for the baking dish
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3 pounds Yukon gold potatoes (about 8 medium)
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3/4 cup whole milk
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4 tablespoons unsalted butter
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1 teaspoon kosher salt, plus more as needed
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1/4 teaspoon freshly ground black pepper
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1 cup sour cream (8 ounces)
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8 ounces sharp cheddar cheese, shredded (about 2 cups)
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1 ounce Parmesan cheese, finely grated (about 1/2 firmly packed cup grated or 1/3 cup store-bought)
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Finely chopped fresh chives or parsley, for garnish (optional)