01 - Line a baking sheet with parchment paper and set aside.
02 - Place the chopped dark chocolate in a heatproof bowl set over a saucepan of simmering water (double boiler method), stirring gently until completely smooth. Alternatively, microwave in 30-second bursts, stirring between each interval, until fully melted and glossy.
03 - In a large mixing bowl, toss together the roughly chopped cashews, chopped Medjool dates, and puffed rice cereal if using, until evenly distributed.
04 - Pour the melted dark chocolate over the cashew and date mixture. Stir thoroughly using a spatula or spoon, ensuring every piece is completely coated in chocolate.
05 - Using a tablespoon, drop mounded spoonfuls of the chocolate mixture onto the prepared parchment-lined baking sheet, spacing each cluster about 1 inch apart to prevent sticking.
06 - Sprinkle each cluster lightly with flaky sea salt while the chocolate is still warm and melted, so it adheres properly.
07 - Transfer the baking sheet to the refrigerator and chill for at least 30 minutes, or until the clusters are completely firm and set to the touch.
08 - Once fully set, transfer the clusters to an airtight container and store in the refrigerator for up to one week.