Chop the Chocolate: Finely chop the chocolate and place it in a heatproof bowl.
Heat the Cream: In a small saucepan, heat the heavy cream until it just begins to simmer. Do not boil.
Make the Ganache: Pour the hot cream over the chocolate. Let sit for 2–3 minutes, then gently whisk until smooth and glossy. Stir in butter and vanilla.
Chill the Ganache: Cover the bowl and refrigerate for 1–2 hours, or until firm enough to scoop but still pliable.
Scoop and Roll: Use a small scoop or spoon to portion the ganache. Roll quickly between your hands to form smooth balls. If soft, chill briefly before rolling.
Coat the Truffles:Roll each truffle in cocoa powder, chopped nuts, coconut, or dip in melted chocolate. Return to the fridge briefly if needed to set.