Remove the peel from the bananas. Line a baking sheet with parchment paper.
Place the bananas on a cutting board and cut the bananas into one inch slices.
Put the banana slices on the prepared parchment paper lined baking sheet. Flash freeze the bananas by putting the baking sheet in the freezer for at least 2 hours or until they are frozen solid.
When they are frozen solid, remove the banana pieces from the freezer and put them in a gallon sized Ziploc bag. Freeze for up to 6 months.
Notes
Make sure to clearly label the Ziploc bag or airtight container with the frozen bananas. A sharpie is a great option so you know how long the bananas have been in the freezer.