Super fast! All you do is place this bag of potatoes in the microwave for ten minutes. Yes, the whole bag. No cutting! No scrubbing! Then place them in a bowl and mix'em up. I, of course, added a 1/2 stick butter and some half'n'half...because I believe that's how God intended us to eat mashed potatoes. On sale they run about $2.99 a bag. Oh, and they taste great, too.