Too much work--chuck the whole, unpeeled banana into the freezer. It will turn black, do not be alarmed. When you're ready to bake, take it out, defrost it in the fridge or counter. Snip off the top of the banana, it will have the texture of a pureed banana, you squeeze it out like a tube. It works great, I actually prefer the frozen ones for bread/muffins, it mixes great and has a deeper banana flavor.