01 - Line a small loaf pan or chocolate mold with parchment paper or lightly grease it.
02 - Combine the chopped dark chocolate and butter in a heatproof bowl. Melt gently over simmering water using a double boiler, stirring until smooth.
03 - Remove from heat and stir in the powdered sugar and vanilla extract until fully combined.
04 - Fold in chopped nuts, dried fruit, and a pinch of sea salt if using.
05 - Pour the mixture into the prepared mold and smooth the top evenly with a spatula.
06 - Tap the mold gently on the counter to release any trapped air bubbles.
07 - Refrigerate for at least 40 minutes until the chocolate is fully set.
08 - Remove from the mold, cut into bars, and store in an airtight container in a cool place.