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Aluminum, is a much better conductor of heat then cast iron. That's why this works, as the heat is distributed to the air surrounding the item being baked fast and evenly. Heat wants to rise, the second lid with insulation keeps heat from escaping from the top of the pot as...
I have been using an aluminum Dutch Oven on camper stove top to bake pies and biscuits, as I have no oven in pop- up style camper. It is a small 10" GSI hard anodized legless style. I put another skillet top on top of it with insulation in it to keep heat from escaping from cast top. Works...