Switching banana bread to banana cake?

Thanks @RachelS - it's in the oven now. I am a little worried about the texture but the general volume looks right, so I'll hope for the best.

You likely can bake it in an 8x8 pan with fine results, but I would perhaps start checking it beginning 15 minutes before the banana bread was supposed to be done had you cooked it in a loaf pan. I've seen (and made) a few cake and quick read recipes that give directions for loaf and/or Bundt pans (depending on what's available to you or what you prefer to use), and I'm guessing that while a Bundt pan would give you more of a similar texture and baking time to a loaf pan (if you have enough batter for a Bundt pan that is) an 8x8 pan will probably be tasty as well though I'd prepare for either a gooey center or well-cooked outer edges. Maybe stick both the center and outside with a toothpick until they are at the happiest medium for you!