Prepare the Ganache
Heat cream and butter over low heat until just simmering.
Pour over chopped white chocolate in a heatproof bowl. Let sit 1–2 minutes, then stir until smooth.
Add Flavor
Stir in crushed freeze-dried blueberries, vanilla extract, and a pinch of salt until fully combined.
Chill the Mixture
Cover the bowl with plastic wrap and refrigerate at least 2 hours until firm enough to scoop.
Form the Truffles
Scoop small amounts using a spoon or melon baller and roll into balls.
If the mixture sticks, chill slightly longer.
Coat the Truffles
Roll in extra white chocolate, crushed freeze-dried blueberries, or cocoa powder.
Place on a parchment-lined tray.
Final Chill
Refrigerate for 30 minutes before serving to set completely.