In the mixing bowl with potatos, add all the butter. Mash the potatos and butter with potato masher. Add onion salt, pepper and salt. Stir. Taste. Adjust seasonings. Add sour cream, bacon and cheese, and chopped potato skins, stir to mix well. Put potatos in a buttered 13 X 9 pan, and return to oven. Reduce heat to 350 degrees, bake appox. 30 more minutes until potatos are browned and bubbly.