Peel potatoes and cut into small cubes. Throw the potatoes in a large pot filled with cold water. Cook for 25 minutes or until fork-tender. Drain the potatoes and put them back into the hot pot. Add cream cheese, butter, milk, and salt. Mash with a potato masher or use a hand mixer to whip the potatoes. Spoon mixture into a freezer-safe container and label.
Thanksgiving Day: Put potatoes in the fridge 1-2 days before to allow them to completely thaw. Spray slow cooker with cooking spray and put potatoes in the slow cooker. Brush the top of the potatoes with a tablespoon of butter and sprinkle with paprika.
Cook on low for two to four hours.
If you would rather bake these, bake the potatoes at 350 degrees for thirty to forty minutes or until completely hot.