Clean and dry potatoes, then rub them with olive or canola oil. Place them on a baking sheet or right onto your oven rack. Bake until fork tender (about 1 hour). Once potatoes are cooked, lower temperature of oven to 350 degrees. Peel the potatoes, if you prefer, or keep the skin on. Mash 4-6 potatoes and cut the other 2-4 potatoes into cubes, placing them into a large bowl.