Have you guys ever had a sun oven? man... I love mine!
I use it for baking banana bread because it makes it so moist.
I've done stews and roasting squash and baked potatoes, various breads etc.
you can make them with cardboard box, some aluminum foil and a piece of glass and newspaper for insulation very cheep for a test device to see what you think.
here's vid I made of some banana bread lolhttps://www.youtube.com/watch?v=JNULPbu03Yk