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This is something i've always had difficulty finding a foolproof method for. Some swear by keeping it unpeeled, but I find that it's harder to unpeel. If cut up, it looks like you need multiple ziploc bags to ensure that it doesn't turn colors, and that a freezer bags aren't 100% effective.
Is there a tried and true foolproof way to freeze bananas?
The best way to freeze bananas so that they don't turn brown and are easy to use, is to peel, slice and flash freeze before you put them in a freezer bag. Simply peel and slice your bananas. Lay them flat on a piece of parchment paper on a cookie sheet and put in the freezer for 2 hours until they are solid. Transfer them to a freezer bag and remove as much air as possible. You can freeze these for up to 3 months and they will not turn brown.
I often make bananas into banana bread, and what I usually do is peel them into a gallon ziploc bag. Next, I mush them inside the bag, then evacuate all the air and squeeze the mash towards the bottom of the bag (and I like to roll it up to help it stay nice an sealed). You can do this one at a time as you collect overripe bananas, or in a group.
This lets you have relatively little browning and also have pre-mashed bananas on-demand.
Additionally, as you add bananas to the bag, use a Sharpie to tally how many you've put in the bag. Then, for banana bread (for example) once you have however many are in a single/double batch you can set the bag aside and start on a new one. You then have a pre-measured quantity of bananas ready to go, and you can even cut a corner off of the ziploc to make it function like a piping bag for mushed bananas.
This works great if you want mushed bananas to bake with, not so well in any other use-case.
