""Not only is this a delicious alternative to regular mashed potato recipes, but it's a very user-friendly way to serve your potato side dish. They're really decadent: not too rich, but just rich enough, and perfect for any special occasion."..."
INGREDIENTS
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4 1/2 pounds russet potatoes, peeled and halved lengthwise
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1/2 cup mascarpone cheese at room temperature
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1 egg yolk
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3/4 cup milk
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salt and freshly ground black pepper to taste
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1 pinch cayenne pepper, or to taste
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1 cup butter, cut into chunks