Preheat the oven to 400°F. Scrub the potatoes clean and pat dry. Place them on a baking sheet, brush all over with olive oil, and sprinkle evenly with salt. Bake for 40–45 minutes, or until fork-tender. Remove from the oven and let cool slightly.
Slice the potatoes in half lengthwise. Scoop out most of the flesh, leaving about ¼ inch of potato attached to the skin to keep them sturdy.
Place the potato skins cut-side up on the baking sheet. Sprinkle each skin with shredded cheddar cheese and cooked, crumbled bacon.
Return the baking sheet to the oven and bake for 12–15 minutes, or until the cheese is melted and bubbly and the edges are lightly crisp.
Remove from the oven and serve warm with sour cream and chopped chives.