"Rich and creamy potatoes au gratin is the ultimate comfort food made with sliced potatoes, cheese, and milk. It's the perfect side dish for the holidays...."
INGREDIENTS
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2 pounds Yukon gold potatoes, peeled and thinly sliced
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2 tablespoons unsalted butter
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1/2 medium onion, diced finely
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2 cloves garlic, minced
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2 tablespoons all-purpose flour
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1 and 1/2 cups whole milk
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1/2 teaspoon salt
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1/4 teaspoon ground black pepper, or to taste
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1 cup sharp white cheddar cheese, shredded
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1/4 cup Grana Padano cheese, shredded
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fresh green onions, chopped (optional, for garnish)