My cookies baked about an hour at 300 degrees on a hot and sunny day. Actual cooking time will vary depending on the type of solar cooker, the weather, and the amount of food being cooked. For best results, and the shortest cooking time, keep the oven pointed directly into the sun.
To make the gluten free, dairy free, egg free version of this recipe, I substituted an egg replacer for the egg, and Cup 4 Cup gluten free flour for the regular flour. The cookies baked about an hour in the solar oven. The cookies tasted almost identical to the original recipe.
To bake in a regular oven, follow the same directions and bake at 350 degrees for 6 minutes.