Lots of great sous vide mashed potato recipes.
My favorite way for baked potatoes involves the microwave although it works fine without microwaving.
Cut medium potato in 1/2
Microwave 1 minute.
Place in oven or toaster oven for about 20 minutes. The top (cut part) of the potato will puff up and brown when the potato Is done.
The puffed up potato tastes as good or better than the skin and looks very impressive.
Microwaving for 1 minute cut the baking time in half and the potato is always cooked though when the top is puffed. Even a soft skinned or new potato has that baked flavour.