Cookability

Con: requires use of a food-processor or blender, which can be hard for those of us with noise sensitivity.

Pro: minimal prep, lasts indefinitely in the freezer, takes only a few minutes to make, no cooking required, compatible with a very wide range of special dietary requirements, is mysterious food alchemy.

Taken from Instructables: 1-Ingredient Ice Cream:

Take a banana or bananas, peel, chop into chunks, then put in a bag in the freezer.

When desired, take out your frozen banana chunks, put them in a food processor, and blend them.

The result is amazingly creamy in texture, and way sweeter than regular banana, for reasons I cannot fathom.

I don't eat a lot of sugar, and I actually find the result too sweet; I'm going to be experimenting with blending in extra ingredients, including other fruits or cocoa powder.

ETA: If you need/want to take a supplement that's in powder form, blending it in seems to work very well (I tried this with a scoop of whey protein).

ETA2: If you are okay with dairy, blending in some Greek yoghurt is amazingly delicious.