Slice bread lengthwise and spread a layer of pizza sauce over face of each bread half. Sprinkle small amount of garlic powder and parmesan cheese over sauce. Add Mozzarella cheese, then arrange meat slices and mushrooms or olives over cheese. Place both slices on a cookie sheet, place in cooking bag. Leave bag untied and not touching the bread. Bake in solar oven for 1 to 1-½ hrs.