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["To prepare chocolate-peanut butter mixture and chill: Heat cream with peanut butter in a 1-quart heavy bottomed saucepan.", "Use a whisk to break up peanut butter so it melts evenly.", "Meanwhile, melt chocolate in the top of a double boiler over barely simmering water.", "When chocolate and peanut butter is smooth, combine with melted chocolate, using a whisk.", "Force through a medium-mesh sieve into another bowl, using a rubber spatula.", "Stir in vanilla.", "Let cool, then cover and chill 2 to 4 hours (or overnight).", "To up to shape truffles: Whisk powdered sugar and cocoa together, then sift into another bowl to combine thoroughly.", "Grind peanuts, if using, in the bowl of a food processor fitted with the steel blade.", "Line a large baking sheet or tray with waxed paper or 30 to 50 1-inch paper candy cups (yield will depend on the size of your scoop used to shape truffle).", "To shape truffles: If very chilled, let mixture sit out at room temperature for 20 minutes to soften slightly.", "Scoop out or spoon small portions of chilled filling and roll into a ball.", "If desired, push a ""Goober"" through the side, into center of round and roll to correct shape.", "Roll truffle in cocoa mixture or ground nuts and place in candy cups.", "Place in a decorative tin or gift box, separated by sheets of waxed paper or decorative foil.", "Keep chilled to maintain best flavor and texture."]