You can bake the russet potatoes covered with foil (non-shiny outside), plain or oiled and sprinkled with Kosher Salt. I poke the potatoes with a fork. I don’t know if its an old wives tale but I always do this when baking them. After baking, cut them in half lengthwise. Scoop out the insides as close to the edge of the peel as possible. I mash the insides with my potato masher with butter, sour cream, green onion and salt in a medium-size bowl. Heap the filling back into the skins and bake until heated through. Bake at 350 degrees about 30 minutes. Sprinkle with grated cheese on top when you serve them.