Line a medium-sized baking sheet with parchment paper.
Peel and slice the bananas into thick rounds, about 1/3-inch each.
Arrange banana pieces in a rectangular shape on the lined baking sheet, ensuring slices are touching.
Spread the peanut butter evenly over the bananas using a rubber spatula.
Melt the dark chocolate chips in a microwave-safe bowl in 30-second intervals, stirring after each until smooth.
Pour the melted chocolate over the frozen banana-peanut butter layer and spread it evenly.
Return the layered bark to the freezer and let it chill for at least 90 minutes until set.
