This is a marriage of two of the greatest comfort foods of our time: Rotel dip and mashed potatoes. We're talking very satisfying and suuuuuuper-rich. This would be great served with a protein like pork chops, but you can also add a little milk to turn this into a dip. This method of mashing potatoes essentially emulsifies whole butter into hot potatoes, and it's important that you work quickly and don't let the potatoes get too cool. The potatoes will continue to break down as you add the butter, so don't overmash them.