Preheat the oven to 400 degrees. Bake the potatoes whole for about 30 minutes or until they are easily pierced with a fork. Remove from the oven and cool. Cut the potatoes in half and carefully scoop out most of the inner flesh, leaving a little bit around the skin, so that the potato forms a small bowl.
Mash up the scooped-out flesh. Place ½ cup sour cream in a medium bowl. Mix in the milk, salt, and pepper until smooth. Pour into the mashed potatoes and continue mashing. Mix in the crumbled bacon (reserving 2 tablespoons of bacon for garnish) and 2 teaspoons of the chives.
Transfer the mashed potatoes to a piping bag with a large star tip and pipe evenly into the potato skins. Bake for 10 minutes. Let cool out of the oven for 5 minutes.
Garnish with a dollop of sour cream, the reserved bacon crumbles, the remaining chives, and sprinkle with the paprika.