A few months ago I got a great deal on potatoes, ten pounds for two dollars! There was a two bag limit so I got two. Even our big family cannot eat twenty pounds of potatoes before they go bad so I decided to make a huge batch of mashed potatoes and freeze it.
When thawing frozen mashed potatoes you end up with a lot of extra water. At first I tried to squeeze the water out by cutting a small hole in the corner of the ziploc bag they were stored in. This worked, but I always ended up losing a bit of potato as well.
As I was thawing my frozen mashed potatoes today, I realized I could reheat them on the stove and add 1/4 cup of mashed potato flakes to thicken the potatoes. The potatoes thickened up immediately and tasted great!
Mix in the potato flakes and remove from the heat.
The mashed potatoes will immediately thicken.