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