Heat cream – In a small saucepan, heat the cream and butter over medium heat until just simmering.
Melt chocolate – Place chopped chocolate in a heatproof bowl. Pour hot cream mixture over the chocolate and let sit for 2–3 minutes.
Stir smooth – Gently whisk until the chocolate melts into a silky ganache. Stir in vanilla and a pinch of salt.
Chill – Cover the bowl with plastic wrap and refrigerate for 2 hours, or until firm enough to scoop.
Scoop & roll – Using a small cookie scoop or spoon, portion the ganache into balls. Roll quickly between your palms for a rustic truffle shape.
Coat – Roll each truffle in cocoa powder, nuts, or crushed cookies, or sprinkle with sugar as desired.
Serve or store – Enjoy immediately, or store in an airtight container in the refrigerator for up to 2 weeks.