Hi Andy and Jennifer,
We bought the Coleman oven for just that same reason. It is powered with a small propane bottle, and has a glass door. It will fit a 9" casserole dish, as long as the pan does not have handles. We used it once so far to cook a fresh fish that we were given while camping at a lake. We wrapped the fish in foil to avoid getting the smells in the oven.
It actually worked very well, it cooked quickly and evenly, and we were even at about 5,000 feet where cooking usually takes longer. All in all we were very happy with the performance of the oven. That is the only thing that the wife would changeabout our MH if she could, and that would be to have a built in oven instead of a convection microwave.
The oven is well worth the money as long as you are reasonable about how much you can put in it at one time. It's not as good as a built in, as we dry camp a lot, but it works to bridge the gap.
Hope this helps, Sarge
Marty and Diane, Fulltiming!
2017 Tiffin Allegro Bus 40 SP
2018 Jeep Wrangler Sahara