"Learn how to make old-school scalloped potatoes from TT executive editor Karen Palmer...."
INGREDIENTS
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1½ pounds firm, waxy potatoes (such as russets)—peeled, washed and chopped into thin slices (crosswise)
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1 onion, peeled and finely chopped
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¼ pound cheddar cheese, grated
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Salt and pepper, to taste
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4 tablespoons butter, plus more for greasing
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1 egg
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1¼ cups whole milk