Preheat oven to 200°C. Place potatoes on a baking tray and cook in the oven for about 45 minutes or until tender.
Fry bacon in a hot frypan and let cool. To make the filling mix together KEEN’S mustard powder with sour cream, chives and bacon, then season to taste.
Remove potatoes from the oven. Use a spoon to scoop out about 1/3 of the contents of each potato.
Combine the removed potato with the filling mixture and restuff it into each potato before serving.