Place sliced bananas into a freezer bag and freeze for at least 4 hours until solid, preferably overnight.

Place frozen bananas into a food processor or heavy-duty blender and begin pulsing. The bananas will resemble crumbs at first, similar to oatmeal.

Continue processing and, as the mixture begins to get smoother, scrape down the food bowl with a rubber spatula.

As the consistency begins to smooth out, switch to blending and stop frequently to scrape the mixture down so that it continues to be processed by the blade.

After about 10 minutes, the mixture will turn into a creamy consistency resembling a soft serve ice cream. Blend for about 30 seconds longer to incorporate air into the ice cream.

Serve immediately for soft serve ice cream. For a more firm, scoopable ice cream, transfer the mixture to a freezer-safe, airtight container, and freeze for about 2 hours, or until it reaches the desired texture.