Materials

Cooking Containers should be made of a dark, thin metal works well (graniteware, dark nonstick pots/pans). Cast iron takes a long time to heat, but keeps the heat a long time. Glass lids allow the cook to see the food without having to open the container. Dark lids work well too. 

The glaze is the item that traps the heat in the cooker. (It's like a car in the sun is hotter than the air outside of it.) Tempered glass, plexiglass, and plastic all work. Glass bowls, glass air fryer bowls, aquariums, old windows, plastic wrap, glass jars, and baking bags for the oven.

Reflectors can increase the heat in the cooker. Mirrors, foil, mirrored stainless steel, car shades, and mylar all work to redirect sunlight towards the food.

Wood and cardboard can be used in box cooker as the walls of the cooker. Even though the solar cooker can get very hot, these materials will hold up.

Additional items are handy to keep nearby. A thermometer helps to make sure that the solar cooker gets to a safe cooking temperature. Oven gloves keep fingers from burning on the hot cookware. Sunglasses protect eyes from being blasted with light from the reflectors. Insulation prevents heat loss and keeps the temperature consistent when clouds pass by.