01 - Place the chopped dark chocolate in a heatproof bowl and set aside.
02 - In a small saucepan, heat the heavy cream just until it begins to simmer. Remove from heat and pour over the chocolate. Let sit for 2 minutes, then gently stir until smooth and fully melted.
03 - Add the butter, vanilla extract, and sea salt, stirring until the mixture is glossy and well combined.
04 - Cover the bowl with plastic wrap and refrigerate for at least 2 hours, or until the ganache is firm enough to scoop.
05 - Using a melon baller or teaspoon, scoop out small portions of ganache and roll quickly between your hands to form balls approximately 1 inch in diameter.
06 - Roll each truffle in cocoa powder, chopped hazelnuts, or raspberry powder to coat. For an extra decadent touch, dip some truffles in melted dark chocolate and let set on parchment paper.
07 - Store truffles in an airtight container in the refrigerator for up to 1 week. Bring to room temperature before serving.