Peel your bananas, place then in a suitable freezer proof container, perhaps employing freezer boxes or freezer bags and then place them in your freezer.
Leave them in your freezer for a suitable period of time (at least several hours) and then taken them out and enjoy them as a very tasty, frozen treat.
Yes, we admit to being inspired by the folks over at Pukpip who produce very tasty chocolate dipped banana lollies. You can read about them, here https://thatsfoodanddrink.blogspot.com/2023/07/pukpip-on-path-to-rapid-growth.html.
However, my wife does have a chocolate allergy so her idea of non-dipped frozen bananas is very helpful to herself and anyone else who has a chocolate allergy.
Frozen bananas will make an excellent sweet but low sugar snack for any time of the year and I feel they'll make a great treat for Christmas, perhaps especially if served with typical Christmas sweet spices such as ginger, all spice, cinnamon, etc. That is if you can stop people from eating them as soon as they are frozen!)
(Image courtesy of Guilherme Machado from Pixabay)