Thought maybe would want a look at my solar oven. This is a very simple one I have hobbled together, and it works, so am not going to mess with it until have everything together to make a "permanent" one :)
Simply lined an old cooler with foil, that silver thing is a stand to put smaller pots on to raise to the middle, and my dutch oven that I mostly use. The dutch oven I can just place inside (without the silver stand) and put what I want to cook inside it - even another pan or mason jars, place the lid on and I don't have to worry about burning anything! Put the window on and walk away... I LOVE cooking this way!