Preheat the oven to 170C fan. Sprinkle salt over the bottom of a baking tray. Pierce each potato and put in a bowl. Generously drizzle with olive oil and place the potatoes on top of the salt. Bake for 1 hour.
Put the bacon on another baking sheet and place in the oven while the potatoes are cooking for around 15-20 minutes or until crisp. Remove from the oven and allow to cool on kitchen paper to remove excess fat. Chop into small pieces.
Once the potatoes are cooked, leave to cool slightly. Cut each potato with a cross on the top then pinch the side to open the out. Top each potato with sour cream, bacon and chives.