01 -
Place the finely chopped chocolate in a heatproof bowl. Smaller pieces melt more evenly and make a smoother filling.
02 -
Warm the heavy cream and butter in a small saucepan over medium-low heat until steaming around the edges, about 2-3 minutes. Do not boil.
03 -
Pour the hot cream over the chocolate and let it stand for 2 minutes. Stir until smooth, then mix in Nutella, vanilla, and salt until glossy.
04 -
Cover the bowl and refrigerate for at least 2 hours, or until the mixture is firm enough to scoop and hold its shape.
05 -
Scoop 1 tablespoon portions and roll quickly between your palms. If the mixture gets sticky, chill it for 15 minutes before continuing.
06 -
Roll each truffle in chopped toasted hazelnuts, cocoa powder, or both. Refrigerate for 20 minutes before serving.