Preheat your oven to 400°F (200°C). Scrub the potatoes clean and poke them a few times with a fork.
Rub each potato with olive oil and sprinkle with salt. Place them directly on the oven rack and bake for about 45–50 minutes until soft.
Let them cool for a bit, then slice each potato in half lengthwise. Scoop out the insides carefully, keeping the skins intact.
In a mixing bowl, mash the scooped potato with sour cream, milk, butter, half the cheese, crumbled bacon, and green onions. Add salt and pepper to taste.
Spoon the filling back into the potato skins and sprinkle the remaining cheese on top.
Place them back in the oven and bake for another 15–20 minutes, until the tops are golden and the cheese is bubbly.