INGREDIENTS
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1/4 cup butter
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1 1/2 cups onion, diced
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2 tbsp all-purpose flour
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2 cups whole milk
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2 cloves garlic
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2 1/4 cups shredded cheese (I used a blend of cheddar, mozzarella, and monterey jack), divided
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1/3 cup chives, snipped
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4 large yukon gold potatoes (any kind will do), skins on, thinly sliced