Another stove-top oven that has gotten a lot of press in the Overlanding Community is the Omnia Stove Top Oven:
Omnia Oven: The Ultimate Camping Oven - Fresh Off The Grid
Even the Expedition Portal did a write-up on this:
Reviewed: The Omnia Oven We Never Knew We Needed - Expedition Portal
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Figure around $65.00. I'd been mildly tempted to get one to try it out (especially after I had read the Expedition Portal write-up way-back-when linked above), but just haven't yet. Some folks love them. I just think it has limitations (can I make a pizza with one?), and it seems kinda bulky. But if making muffins or a cake, it might just be the ticket. And I wouldn't have to unfold it and put it together like I do with my Coleman folding oven before I can use it. There are optional accessories you can purchase for this thing depending on what you're wanting it to do.
Oven & Accessories - Omnia (omniasweden.com)
Let us know if you've used an Omnia, and what your thoughts are.