Oven at 420, preloaded with bacon.
Grab that nifty old boiling water.
Cut potatoes into small cubes. I leave the skin on, but you don’t have to.
Preheat the oven to 420. While the oven is preheating, throw in the bacon. I flip it in ten minutes, and take it out after 20.
Boil potatoes until they’re soft. Stir them every few minutes until you feel them soften a bit. Maybe 25 minutes?
Strain potatoes and put in a bowl with a few pads of butter. Stir with a wooden spoon or a fork. Add a little cream, and stir more. Add a little more sour/cream and stir more. Add more cream and stir more. Until the potatoes have the consistency and creaminess you prefer.
Salt and Pepper and throw in some shredded cheese.
Put mixed potatoes in a glass casserole dish. Top with more cheese, and chopped bacon and chives? Cover loosely with foil.
Put in oven for like 30 minutes. Or longer.
Maybe take off the foil and leave in the oven for 15 more minutes for a browner top?