I wouldn't have thought it possible to accidentally bake a cake, but if anyone can do it, its me. That's just the kind of cook I am.
I had written down two variations for my Amish Friendship Bread starter, but ultimately decided to go with the sourdough bread. It wasn't until I was well into my mixing that I thought, "wow this is a lot of sugar for bread."
Then I realized I was following the other recipe, and I was past the point of no return. So I went with it, and here's a chocolate cake instead. Hey, I got to use my bundt pan.