We tried breakfast parcels the other day (make a foil tray, place oil, sliced spuds, bacon, sausage, crack an egg into it, mushroom, tomato etc. into it and cover in a foil 'envelope') and the eggs baked in there were very tasty indeed... I thought they would vastly overcook in the time taken to cook the sausage but they didn't - the yolk was hard but that's how I like it! I bet you could probably bake them without all the other bits, just on a base of potatoes and they'd come out very nicely. Quite foil intensive though!