Use a potato with a high starch content …it makes for a puffier baked potato. Good starchy potatoes are: russet and Idaho.
Look for potatoes that have a smooth skin and no sprouts. Stay away from those with wrinkly skin or soft spots.
Store your potatoes in a cool dark spot away from your onions.
And don’t store them for months on end. A couple of weeks is what you should plan for


