I've made them on a Coleman stove and inside my trailer on the propane stove, both worked out the same. Never tried cornbread mix but I have bought some to experiment with. I used waffle and pancake mix. The key is not to overfill the iron. The mixes do rise somewhat while cooking. Also if using fruit don't mix it in the batter. Drop in the middle before cooking

Don't ask me how I figured that one out. The irons can be a real mess to clean up after you burn stuff in them. Good luck and post about the cornbread mix worked if you use it.