A serving fork.
Buy then in a box...
Have you ever seen Lucy crush grapes? All you'll need is a large pot
Well, well, aren't you the cutest thing! I quit usin' a tater masher way back in 1972 when my late husband Carl bought me one of them fancy electric mixers.
Place all the potatos on the bed and let a couple of 5 years old jump up and down on them. You will do two things in one stone. The kids could have a lot of fun and do the mashing for you. warning, you may need to wash your sheets after this activity.
Just use your feet (although you might want to wash them first, unless of course, you like toe-jam flavored potatoes).
Mixer. The only way.
an electric mixer