INGREDIENTS
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2 tablespoons butter
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1 large or 2 medium sweet onions, such as Vidalia, thinly sliced
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Salt and freshly ground black pepper
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1/2 teaspoon ground thyme
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1 bay leaf, fresh or dried
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2 pounds baby Yukon gold potatoes or fingerling potatoes
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1/2 to 2/3 cup heavy cream
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1/2 cup grated Parmigiano-Reggiano
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1/2 pound brick Gruyere or Swiss cheese, shredded