01 - Line an 8 x 8 inch baking pan or chocolate bar mold with parchment paper.
02 - Melt dark chocolate and coconut oil (if using) in a heatproof bowl over simmering water, stirring gently until smooth.
03 - Remove from heat and fold in roasted mixed nuts and optional dried fruit until evenly incorporated.
04 - Pour the chocolate mixture into the prepared pan or mold, spreading evenly with a spatula.
05 - Gently tap the pan to release air bubbles, then sprinkle flaky sea salt on top if desired.
06 - Refrigerate for at least 40 minutes or until the chocolate is fully set.
07 - Remove from pan and cut into 8 bars or break into pieces before serving.