INGREDIENTS
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3 tablespoons butter
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3 garlic cloves, pressed in a garlic press
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1 medium onion, minced
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2 tablespoons fresh thyme leaves
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kosher salt and freshly ground black pepper
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2 cups heavy cream
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1 cup chicken broth
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4 pounds russet potatoes, sliced thinly, about ? inch thick
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3 bay leaves
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1 cup medium cheddar cheese, shredded
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2 cups Parmesan cheese, shredded