Bumped into the idea of a jello mold oven a little time ago and tried it out. Found all the parts at my local thrift shop. My stove is a Optimus Hiker plus. The thing worked just as they said it would. For a heat defuser I used a square of 16 guage steel, about 7x7. I really am too lazy to go in for much fancy cooking, but I do love cornbread. Bob's Red Mill has a mix that is dead easy. Trying to decide where I was going to pack the jello mold and lid and got the idea of seeing if the baking would work as well in my frying pan. I carry a nice fitting lid for the frypan anyway. Shoot! it worked even better! So now I have a un-needed jello mold oven, that's all right it was fun playing with the idea. If I ever get tired of cornbread I'll experiment with other mixes but for now my dog and I are happy with fry pan cornbread.
Best Wishes, Rob