I halved this recipe, baking it in an 8" square pan for 40 minutes, which worked well. I only used one egg instead of one and a half, but it was a large egg. Two small eggs would have worked as well, I suppose.
I didn't frost it. Maybe that's why it was missing something. It's a good cake, light and moist, but it wasn't great. Maybe more cinnamon and a little extra salt would make it better. It may benefit from sitting overnight.
I would also say the icing is not optional.