INGREDIENTS
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2 tablespoons unsalted butter
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½ cup chopped onion
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1 clove garlic, minced
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2 tablespoons all-purpose flour
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1 teaspoon salt
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½ teaspoon garlic powder
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1½ cups whole milk, room temperature
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1 pound potatoes (roughly 2 large potatoes), peeled and thinly sliced
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1 cup shredded cheddar cheese