Clean potatoes then pierce each one all over with a fork.
Rub the potatoes all over with some olive oil then bake directly on the oven rack for around 1 hour 20 minutes, or until the potatoes are cooked through.
While the potatoes are baking, fry the bacon pieces until crispy, and then place them on kitchen paper and leave to cool. Then break them up into small pieces.
Once the potatoes are cooked, leave them to cool for a few minutes, then slice them in half and then scoop out the potato insides. Place the skin bases on a baking sheet.
Add the scooped potatoes to a bowl and mix with the butter, sour cream, and milk and mash so that it becomes smoother in consistency. Then add 1 cup of grated cheese and half the green onions and half the bacon.
Spoon the mixture back into the potato skins and sprinkle with more cheese, green onions, and bacon.
Reduce the oven's temperature to 350 F. Bake the potatoes for a further 15-20 minutes, until the cheese has melted.