I used my 13.25" cast iron skillet to bake a large carrot cake. I found the recipe online and adjusted the cooking length to accommodate the larger pan.
Yeah it's pretty great. I don't have it too often so when I remember to make it doesn't last long. I made one last week and gave half of it away and finished the rest within a week. That one did have cream cheese frosting but I decided to have this one plain or with some powered sugar. I hope it goes well for you!
I will say that the first one I let cool for about 45 minutes and it came out of the pan easily. The second one I let cool for 15 minutes and it stuck with some of the bottom still attached to the pan. Most recipes I saw online said to let cool completely.