01 - Line a baking sheet with parchment paper.
02 - Toast hazelnuts in a dry skillet over medium heat for 5 to 6 minutes, stirring regularly, until aromatic. Allow to cool; rub in a towel to remove skins if desired.
03 - Toast unsweetened shredded coconut in a dry skillet for 2 to 3 minutes until lightly golden. Let cool completely.
04 - Melt dark chocolate and coconut oil, if using, in a heatproof bowl set over simmering water or in the microwave in 20-second intervals, stirring until smooth.
05 - Stir in pure vanilla extract and a pinch of sea salt to the melted chocolate.
06 - Fold toasted hazelnuts and coconut into the melted chocolate mixture, ensuring even coating.
07 - Scoop heaping tablespoons of the mixture onto the prepared baking sheet, spacing clusters apart.
08 - Refrigerate clusters for 30 minutes, or until completely set.
09 - Transfer set clusters to an airtight container and keep at room temperature for up to one week.