01 - Place the chopped dark chocolate in a heatproof bowl.
02 - In a small saucepan, heat the cream over medium heat until it just begins to simmer. Do not boil.
03 - Pour the hot cream over the chocolate. Let stand for 2 minutes, then gently stir until smooth and fully melted.
04 - Stir in the softened butter, alcohol-free Irish cream syrup, vanilla extract, and salt until fully incorporated.
05 - Cover and refrigerate the mixture for 1–2 hours, until firm enough to scoop.
06 - Line a baking sheet with parchment paper. Using a melon baller or teaspoon, scoop out small amounts of ganache and roll into balls with your hands. Lightly dust hands with cocoa to prevent sticking. Place on the baking sheet.
07 - Freeze truffles for 20 minutes to firm up before coating.
08 - Melt the dark chocolate and coconut oil (if using) in a heatproof bowl over simmering water or in 20-second bursts in the microwave, stirring until smooth.
09 - Using a fork or dipping tool, dip each truffle into the melted chocolate, letting excess drip off. Return to the sheet.
10 - While still wet, sprinkle with cocoa powder, chopped hazelnuts, or chocolate sprinkles as desired.
11 - Let the truffles set at room temperature or refrigerate until firm.