Preheat oven to 400F.
Place potatoes on a baking sheet and roast until tender, about 25-30 minutes. Remove and set aside until cool enough to touch. Cut each potato in half and scoop the insides out into a medium-size mixing bowl. Place the skins cut sides up back onto the baking sheet.
Once all the potatoes are scooped out, add the spinach, artichokes, cream cheese, 1/4 cup Parmigiano Reggiano, salt and ground black pepper to the bowl with the potato flesh and mix well.
With a small spoon, scoop the spinach-artichoke-potato mixture into the little potato skins, top with the remaining Parmigiano and place back in the oven until the cheese is lightly browned, about 10 minutes.