Wow! That's almost exactly what I made earlier today. 29 oz. can of peaches, 2 boxes of French vanilla cake mix and about a stick of butter. I sprinkled about a tablespoon of ground cinnamon on the peaches before I added the dry cake mix.
It came straight off the coals and I put it in my sidecar and covered it with some brown craft paper (recycling some packing material :D ) Rode 45 minutes, had lunch and went to a friends house where we had pie (and the cobbler was my contribution.) The cast iron kept it warm until we served it.
To answer some of the questions - I like to use coals because I can control the heat on top vs. the heat on the bottom. The only way to mess this one up is to use too many coals and burn it.
And yes, it's really good with ice cream. If that's not handy, milk will do. It really needs something because it's pretty heavy duty by itself.
Sorry, I didn't have time to take pictures - had a schedule to keep.