01 - Line a baking sheet with parchment paper.
02 - Peel the bananas and slice into ΒΌ-inch thick coins. Arrange in a single, slightly overlapping layer to form a rough rectangle on the prepared baking sheet.
03 - Place chopped chocolate in a microwave-safe bowl and heat in 20-second bursts, stirring between each interval, until completely smooth and glossy.
04 - Pour the melted chocolate evenly over the arranged banana slices, spreading gently with a spatula to ensure full coverage.
05 - Drizzle peanut butter over the chocolate layer if using. Sprinkle chopped roasted nuts, mini chocolate chips or cacao nibs, and flaky sea salt evenly across the surface.
06 - Transfer to the freezer for 45 to 60 minutes, or until the bark is completely firm and set.
07 - Remove from the freezer and break into irregular pieces or slice with a sharp knife. Serve immediately for the best crunchy texture.