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As virtuous as greens may be, this is not the time of year for them to rest on their laurels. Rather, it’s the season for covering them in a creamy white sauce and topping them with buttery bread crumbs and decadent cheese. This au gratin dish is perfect for your holiday table--it can be prepped in advance, in individual portions or in one big family-size baking dish. Diet starts in January.
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