Peel bananas and slice into rounds. Lay flat on a parchment lined baking sheet and freeze for 2 hours, or until solid. The longer you can freeze them the better.
Place the frozen banana slices in a food processor. Pulse to begin crumbling the banana pieces. Keep pulsing and scrape the sides down if you need to.
Once the banana starts to get smooth and the chunks are disappearing, turn your food processor on and process until you get a magical soft-serve ice cream consistency.
Add any mix-ins and pulse to mix.
If you want a really soft-serve consistency, you can eat it right away. Otherwise, put it in an airtight container and freeze it until solid for a more traditional ice cream consistency. Enjoy!