Blamb writes (in the comment box) Ooze & browning? I still have no idea what you mean by that. Look at my pics, they're not oozing or brown!

Well, Blamb, all due respect, but mashing leads to oozing. We can't SEE the insides of your sandwiches. And besides, with all that surface area showing, unless you wolf that sandwich down, the banana is going to get brown. It is also a texture issue. Mushy banana feels predigested to me. I can't deal with that. But if YOU are into mashing, then by all means, mash away!