Preheat oven to 350º. Season potatoes with salt and pepper and rub with olive oil. Bake until tender, 1 hour 30 minutes. Raise oven temperature to 450º.Let potatoes cool, then halve lengthwise and scoop out potatoes, leaving 1/4″ potato on all sides.Place potato skins facedown and brush with oil. Bake until golden, 10 minutes.Meanwhile, shape ground beef into burgers the same size as buns. Season with salt and pepper and cook until medium, 5 minutes per side.Flip and fill potato skins with bacon and cheese. Return to oven until cheese is melty, 5 minutes.Fill skins with sour cream and chives, then top one with a cooked burger and another potato skin.