Perfect Potatoes au Gratin
INGREDIENTS
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2 tablespoons butter, softened
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8 large russet potatoes, scrubbed clean
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3 cups heavy cream
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1 cup whole milk
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1/4 cup all-purpose flour
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2 teaspoons salt
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Freshly ground black pepper
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2 cups freshly grated sharp Cheddar
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2 green onions, sliced thin (white and light green parts only)
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