01 - Place the finely chopped white chocolate in a heatproof bowl and set aside.
02 - In a small saucepan, combine heavy cream and butter. Heat over medium heat until just simmering, being careful not to boil.
03 - Pour the hot cream mixture over the chopped chocolate. Let stand for 2 minutes, then stir gently until completely smooth and melted.
04 - Fold in the crushed freeze-dried raspberries until evenly distributed throughout the ganache.
05 - Cover the bowl and refrigerate for at least 2 hours, or until firm enough to scoop cleanly.
06 - Using a small spoon or melon baller, scoop portions and roll into smooth balls with lightly greased hands. Arrange on a parchment-lined baking sheet.
07 - Chill the shaped truffles for 15 minutes to firm before coating.
08 - Dip each chilled truffle into the melted white chocolate, allowing excess to drip off. Return to the parchment-lined tray.
09 - While the chocolate coating remains tacky, dust each truffle generously with powdered sugar. Optionally sprinkle with raspberry powder for enhanced color.
10 - Allow truffles to stand at room temperature until the coating is completely firm and set, approximately 30 minutes.