01 - Line a baking sheet with parchment paper and set aside.
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 banana layer, spreading gently with a spatula to cover all the slices.
05 - Drizzle peanut butter over the chocolate if using, then sprinkle chopped nuts, mini chocolate chips, and flaky sea salt evenly across the surface.
06 - Transfer to the freezer for 45 to 60 minutes, or until the chocolate is completely set and firm to the touch.
07 - Remove from the freezer and break or slice into pieces. Serve immediately for the best crunchy texture.