I had some bananas which had gone brown very quickly. I saw this on a fab blog written by Angie. http://www.overthekitchencounter.com/over_the_kitchen_counter_/
She has the best cooking and baking videos. I found this recipe very easy to follow and the results very yummy. There were 12 to start with but my dad had to try two just to make sure the first taste was right lol. So thank you Angie these were fab.