Preheat oven to 400°F and position rack in the center.
Scrub potatoes clean and pat dry, then prick each potato several times with a fork.
Rub potatoes all over with olive oil and sprinkle generously with sea salt.
Place potatoes directly on oven rack and bake for 60-75 minutes until skin is crispy and inside is tender when pierced with a fork.
Remove from oven and let cool for 5 minutes, then cut a deep slit lengthwise across the top of each potato.
Gently squeeze the ends of each potato to open it up, then fluff the insides with a fork.
Add 1 tablespoon of butter to each potato and allow to melt into the fluffy interior.
Top each potato generously with shredded cheddar cheese, crumbled bacon, a dollop of sour cream, and fresh chives before serving.