Scrub the potatoes and dry them. Poke with a fork 3-4 times. Coat with oil and sprinkle with coarse salt. Lay on large baking sheet. Bake at 375 for 45-60 mins until softened.
Allow the potatoes to cool for about 10 minutes. Cut the very top off the potato and using a spoon scrape out the potato, leave about a 1/8 inch layer in the potato skin to help it hold it’s shape. Place the potato that is scooped out into a large bowl. Continue until all the potatoes are done.
Using a potato masher, mash the potatoes and mix together all of the ingredients. Taste the potatoes and adjust flavors and seasonings as needed. Add milk as needed to get desired texture.
Spoon the mashed potato mixture into the potato skins. Sprinkle the tops with remaining shredded cheese, bacon bits, and chopped green onion. Place a small slice of butter on top of each potato. Broil for 5-10 minutes.