Heat the heavy cream in a small saucepan over medium heat until it begins to simmer.
Remove the saucepan from the heat and add the chopped dark chocolate, salt, and vanilla extract.
Stir the mixture until the chocolate is completely melted and smooth.
Pour in the Irish whiskey and mix until well combined.
Cover the ganache with plastic wrap and refrigerate for at least 2 hours until firm.
Once firm, use a small scoop or spoon to portion out the ganache and roll it into balls.
Roll each truffle in cocoa powder or chocolate shavings, coating them evenly.
Place the finished truffles on a plate or in an airtight container, and serve or store them in the refrigerator.