01 - Line a baking sheet with parchment paper. Break matzo sheets into large pieces and arrange in a single layer on the prepared sheet.
02 - Melt the chocolate and butter together in a heatproof bowl set over a saucepan of simmering water, stirring constantly until smooth and fully combined. Alternatively, microwave in 20-second intervals, stirring between each, until completely melted.
03 - Pour the melted chocolate mixture evenly over the matzo pieces. Use a spatula to spread the chocolate, ensuring each piece is thoroughly coated.
04 - Immediately sprinkle the chocolate-covered matzo with chopped nuts, dried fruit, and a pinch of flaky sea salt if desired, working quickly before the chocolate begins to set.
05 - Refrigerate the baking sheet for at least 30 minutes, or until the chocolate is completely firm and set to the touch.
06 - Break the chilled matzo into smaller pieces and serve immediately. Store leftovers in an airtight container in the refrigerator for up to 1 week.