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["In a kettle cover the potatoes with cold water and bring salted water to a boil.", "Simmer potatoes for 12 to 15 minutes, or until they are tender.", "Drain potatoes and force them through a ricer into a bowl.", "Stir in the butter, 2 egg yolks, salt, and the white pepper and let mixture cool for at least 20 minutes or up to 2 hours.", "Preheat oven to 425 degrees F.", "Transfer 1/4 cup of the mixture to a lightly floured surface, with lightly floured hands pinch off a piece the size of a marble, and reserve it.", "Roll the larger portion into a smooth ball, and drop it gently into one of the chilled molds.", "Make a shallow indentation gently in the top of the ball, form the reserved marble size portion into a smooth ball, and carefully place it in the indentation.", "In a small bowl combine the last egg yolk with the milk and brush the egg wash onto each of the ""brioches"" , being careful not to let it drip down the side of the mold.", "Bake on a baking sheet for 25 to 30 minutes, or until they are golden brown.", "Let them cool on a rack for 20 minutes.", "Loosen the edges with a metal skewer and invert to carefully remove from molds.", "They may be made one day in advance.", "Store chilled and covered, and reheat at 400 degrees F. for 15 minutes."]
