Lay 2 cutting boards on counter and place one potato in between boards. Make crosswise cuts across potato every ~¼”, stopping ¼” from the bottom of the potato. (See photo in post.) Repeat with remaining potato.
Place sliced butter evenly in between the slices. (Tip: You don’t need butter in between every slice. Just space the butter out evenly.) Top with salt and pepper to taste.
Place potatoes on foil-lined baking sheet; bake for 60 minutes, or until skin is crispy and golden brown.
While potatoes are baking, cook bacon until crispy and then crumble into pieces; set bacon aside.
Once potatoes are done, sprinkle cheddar cheese evenly on top.
Top potatoes with sour cream, crumbled bacon and chopped chives.