01 - Line a 9x13 inch baking sheet with parchment paper, ensuring the edges are fully covered.
02 - Lay the banana slices in a single layer across the parchment, slightly overlapping, to form an even base that covers the entire surface.
03 - Place the chopped chocolate and coconut oil in a microwave-safe bowl. Microwave in 20-second bursts, stirring between each interval, until the mixture is smooth and completely melted. Alternatively, melt gently over a double boiler, stirring frequently.
04 - Pour the melted chocolate evenly over the arranged banana slices. Use a spatula to spread it into a uniform layer, covering all the bananas.
05 - Immediately scatter the chopped roasted nuts, mini chocolate chips, shredded coconut, and a pinch of flaky sea salt over the wet chocolate surface.
06 - Transfer the baking sheet to the freezer and chill for at least 1 hour, or until the chocolate is completely firm and set.
07 - Remove from the freezer once firm. Break the bark into rustic, uneven pieces by hand or with a knife. Serve immediately or store in an airtight container in the freezer.