01 - Peel the bananas and cut them into 1-inch slices. Discard the peels.
02 - Arrange the banana pieces in a single layer on a parchment-lined baking sheet. Place in the freezer for at least 2 hours until completely solid.
03 - Transfer the frozen banana slices to a high-speed blender or food processor. Blend until the mixture becomes creamy and smooth, pausing to scrape down the sides as needed.
04 - If desired, add vanilla extract, cocoa powder, or nut butter and blend again until fully incorporated.
05 - Serve immediately for a soft-serve texture, or transfer to a freezer-safe container and freeze for 1 to 2 hours for a firmer scoopable consistency.
06 - Top with fresh berries, chopped nuts, or dark chocolate chips as desired and serve immediately.