Mash the bananas and spread them out into a ¼-inch thick layer on a sheet pan lined with parchment paper. Freeze for at least 30 minutes so the bananas become slightly set. 

If your peanut butter is not a thin consistency (like natural peanut butter often is), warm it in the microwave in 5-10 second increments until it’s slightly drizzly and smooth. Pour and spread on the banana layer. 

Freeze the banana and peanut butter for at least an hour so the peanut butter is set. 

Microwave chocolate in 10-second increments, stirring in between until the chocolate i melted. Spread the chocolate on top of the banana and peanut butter layers and sprinkle with your desired toppings. Freeze for at least 4 hours or overnight. 

Break the banana bark apart into roughly 2-inch pieces. Store in the freezer for up to 3 months in an airtight container and enjoy frozen!