Transfer the sliced bananas into a freezer safe container/ freezer bag and leave them for atleast 3 hours or overnight ( I left them overnight)
Put them in the mixie jar/powerful blender/ food processor and blend them. I used Mixie, so I gave intervals between each grinding and scraped the sides every time. Icy texture will turn into creamy goodness after some grinding. Grind once after getting the creamy texture to aerate the ice cream
Serve it immediately or freeze for 2-3 hours and serve. Topped my son's ice cream with chocolate chip, some pecans, and walnuts for us