01 - Combine chopped semi-sweet chocolate, instant espresso powder, and a pinch of salt in a heatproof bowl.
02 - Gently heat heavy cream and butter in a small saucepan over medium until simmering.
03 - Pour hot cream mixture over the chocolate. Let rest for 2 minutes, then stir until smooth.
04 - Incorporate peppermint and vanilla extracts into the ganache and mix well.
05 - Cover and refrigerate ganache for 1 to 2 hours until firm enough to scoop.
06 - Line a baking sheet with parchment paper. Scoop heaping teaspoons of ganache and roll into balls. Freeze for 15 minutes.
07 - Melt coating chocolate and coconut oil (if using) in 30-second bursts in a microwave-safe bowl, stirring frequently until smooth.
08 - Using a fork, dip each truffle into melted chocolate. Let excess drip off and place on the baking sheet.
09 - Sprinkle crushed peppermint candies over truffles immediately before coating sets.
10 - Allow truffles to set at room temperature or refrigerate until firm.