My fave jacket potato filling is to hollow out the jackets, then mash the potato with lashings of butter, spring onion, white pepper and cheddar cheese. I then put the re-filled jackets under the grill to brown slightly. Delicious! My tummy is rumbling at the very thought. I've never been to a Pot Luck party, sadly - they don't seem to be a big thing in England. Maybe I should start to get one together with some friends.