Colman Camp oven
You might try a Colman Camp oven, they are completely collapsible, so are easy to store without taking up much room, open up to a useable size that will accept your every day pie, casserole dish, small cookie sheets etc. set it on one of your stove burners an watch the temp gage on the front. It also has an adjustable backing rack. I purchased mine at Wally world for around $30 I think.