01 - Line a 9x13 inch baking sheet with parchment paper, ensuring it lies flat against the surface.
02 - Lay the banana slices in a single layer across the parchment, slightly overlapping each piece to create full coverage with no gaps.
03 - Place the chopped chocolate and coconut oil in a microwave-safe bowl. Microwave in 20-second bursts, stirring thoroughly between each interval, until the mixture is completely smooth and glossy. Alternatively, melt gently over a double boiler, stirring constantly.
04 - Pour the melted chocolate evenly over the arranged banana slices. Use a spatula to spread it into a uniform layer, ensuring all edges are covered.
05 - Working quickly before the chocolate sets, scatter the roasted nuts, mini chocolate chips, shredded coconut, and a pinch of flaky sea salt over the surface.
06 - Transfer the baking sheet to the freezer and chill for at least 1 hour, or until the chocolate is completely firm to the touch.
07 - Remove from the freezer and break the bark into irregular pieces by hand or with a knife. Serve immediately or transfer to an airtight container stored in the freezer.