INGREDIENTS
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4 tbsp. unsalted butter, plus more for greasing
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3 cloves garlic, finely chopped
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1 medium yellow onion, thinly sliced
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¼ cup flour
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1½ cups heavy cream
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½ cup milk
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3 tbsp. finely chopped thyme
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Kosher salt and freshly ground black pepper, to taste
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2½ lb. Yukon gold potatoes, peeled and very thinly sliced
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¼ tsp. paprika