Heat oven to 400°. Bake potatoes for 1 hour or until tender. Cool slightly. Reduce heat to 350°. Cut each potato in half lengthwise. Scoop out pulp, leaving thin shells. In a large mixing bowl, mash the pulp with butter. Stir in sour cream, cheddar cheese, bacon and green onions. Spoon or pipe the mixture into potato shells. Place on a baking sheet. Bake for 30 to 35 minutes or until heated through. Yields 8 servings.