OK here are some notes from my recipe files. This is my modification from the Pioneer Woman.
I don't think I have ever done the full batch. I probably will this Thursday, though.
I do russets.
Ingredients
5 pounds russet or Yukon gold potatoes 10-12 Potatoes
2 sticks butter, softened, plus more for pan
One 8-ounce package cream cheese, softened or spreadable
(or 4 oz. cream cheese * 4 oz. sour cream)
1 cup heavy cream (or ½/½)
½ teaspoon seasoned salt
½ teaspoon kosher salt
¼ tsp. onion powder
1 teaspoon black pepper
12 servings
(With the above recipe “as is,†the potatoes finish out a little dry. Soften them up a bit by adding a little more milk)
Directions
Generously butter a 4-quart baking dish.
Peel and cut the potatoes into chunks. Bring a large pot of water to a simmer and add the potatoes. Bring to a boil and cook until fork tender, 20 to 25 minutes.
Drain the potatoes in a large colander. Place them back into the dry pot and put the pot on the stove. Mash the potatoes over low heat, allowing all the steam to escape before adding in all the other ingredients.
http://thepioneerwoman.com/cooking/delicious_creamy_mashed_potatoes/