INGREDIENTS
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2 tablespoons unsalted butter, plus more for baking dish
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1 garlic clove, smashed and peeled
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3 pounds Yukon Gold potatoes, scrubbed, peeled, and thinly sliced
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1 1/4 cups whole milk
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1 1/4 cups heavy cream
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1 teaspoon coarse salt
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1/2 teaspoon ground pepper