1. Wash the potatoes, prick with a fork and bake at 220C/425F/gas mark 7 for about an hour until soft in the middle (test with a knife). Meanwhile make the filling(s) of your choice.
2. When cooked, split potatoes in half, scoop the insides into a bowl, being careful not to break the skins.
3. Mash the potato with the butter or oil until soft then stir in the filling.
4. Lay the potato skins out on a greased baking tray. Spoon mixture back into the skin, press down and sprinkle cheese over the top.
5. Return to the oven for 5-10 minutes until the cheese has melted.
If you're going to be eating outdoors, allow to cool slightly then wrap in tinfoil. If you're eating around a bonfire, ignore step 5, wrap the skins in tinfoil and place carefully in the embers of the fire for 5 minutes to melt the cheese.