Fresh potatoes can also be used. Boil 4 - 8 small to medium potatoes in water until firm but tender, about 15 - 20 minutes. Let cool, then peel and dice enough for 4 cups. Proceed with solar oven directions.
To bake in a kitchen oven, pour the potato mixture into a greased 3 qt casserole dish and bake at 350 degrees for 20 - 25 minutes. Proceed to top with cheese and bacon and onions as above.