Peel and slice bananas, then spread the banana slices out in a single layer on a parchment-paper-lined baking sheet. Make sure the banana slices are not touching each other so they don't stick together when they freeze. Place the baking sheet in the freezer until the banana slices are frozen. Transfer the frozen banana slices to an airtight, freezer-safe container or bag. Label and date the bag before placing it in the freezer. For the best quality, plan to use frozen banana slices within two months of freezing.

Yes, you can! Make sure you use a nut butter labeled "natural" and confirm that the ingredients are just nuts and salt (or no salt).

This recipe easily doubles to make two servings. Make the doubled recipe at once and serve immediately. To make it in advance, pour into Mason jars with tight-fitting lids. Store in the freezer. The night before serving, transfer the jars to the fridge to thaw.

Additional reporting by Jan Valdez