I was turned on to these concepts by this Article: http://www.backwoodshome.com/articles/radabaugh30.html
Steps involved in solar cooking include:
Making the oven, using two boxes, 12x12in. and 18x18 inches.
The small box is the inner box, and the spaces around the boxes are filled with cardboard, wadded up newspapers, insulation, etc.
Reflectors are made by gluing aluminum foil onto cardboard.
A glass top or lid is cut to fit inner box, and rests on weather stripping. This seals the cooking chamber, and prevents heat loss.
So far, we have been successful in cooking: carrots, zucchini, "boiled" eggs, hamburger, stew, beans, pork chops, chicken, etc. Basically, you can cook any thing you might cook in a crock pot as that is what the solar oven is.
What a great way to go green, save energy, harness the power of the sun, save the heat in the house from cooking there, and so on.
Be sure to check out the companion video: https://www.instructables.com/id/EVH9PD5H3QFLEH2/