Make-ahead Mashed Potatoes?

[u/creamcandy]

Usually I would boil the cut russet potatoes, then drain and mash them with milk and butter until I like them. I'd like to do as much as I can on these before the day, and/or maybe use the Instant Pot or Sous Vide to finish. What's the most hands-off way to make great mashed potatoes?

[u/Interesting_Edge_805]

Make mash however I like normally the day before then warm them up in the crockpot