In many of the workshops, and the guest speaking at tiny house events I've done, I always talk about flue-insert ovens for woodstoves, and usually find that a good many people have never heard of them as an option for baking- or of their existence at all. So, plain and simple, here's a photo of one. While they may be a little hard to control in terms of precise temperatures, like cooking anything on a woodstove, they certainly stand as an affordable and space saving option for tiny houses, cabins, and well, any home in general.
Woodstove dealers, and the Northern Tools catalogs often carry these.....
Another option is a Coleman Camp Stove- which do prove reliable- you use them atop gas ranges- pretty simple stuff here. Obviously a Dutch Oven is another good option- you can bake cakes in 'em, biscuits...sky's the limit. Below is a link to some info on one of the better reviewed Dutch Oven's I've seen. There certainly are less expensive ones out there too, and you can keep an eye out for used ones as well- as these things, are fairly indestructible.
Toaster Ovens, and 3-In-1 Breakfast Stations are also another avenue to pursue.
-Derek "Deek" Diedricksen