Preheat oven to 400°F (200°C). Wash and dry potatoes, then prick with a fork. Bake directly on the oven rack for 35–40 minutes, until tender.
Let potatoes cool slightly. Slice in half lengthwise and scoop out most of the flesh, leaving a ¼-inch shell. Reserve scooped potato for another use.
Brush potato skins lightly with olive oil and season with salt and pepper. Bake 5–10 minutes until crisp.
Fill each potato skin with cheddar cheese and crumbled bacon.
Bake 5–7 more minutes, until cheese is melted and bubbly.
Sprinkle with green onions and serve with sour cream if desired.