Preheat oven to 350 degrees F. Pierce all over with a fork. Rub with oil and sprinkle with salt and pepper. Bake for 1 hour to 1 hour 15 minutes, until the potatoes are easily pierced with a fork.
Meanwhile, saute spinach in a skillet for 3 min with a drizzle of oil. You just need the spinach to wilt but stay nice and green. Transfer to a strainer. When cool enough to touch, press out excess water from the spinach.
Remove the middles from the potatoes and add to a bowl along with butter, chopped scallions, salt and pepper. Mix until butter is melted and the mixture is combined.
Add to a bowl along with sour cream, shredded mozzarella, parmesan, artichokes, spinach, salt and pepper. One mixture is combined, scoop back into the potatoes.
Sprinkle a little mozzarella overtop each potato and bake again for about 5-7 min, and 2-3 min at the end on broil until the potatoes are super browned and bubbly. Enjoy!