Everybody seems to have their favorite way of making mashed potatoes. Some cook them with the peel on, some without. Some add a little of the cooking water to the mashed potatoes for extra starch.
I have found that the single thing that makes the biggest difference for making perfect creamy, heavenly potatoes is the type of potatoes you use.
from RSSMix.com Mix ID 8174097 http://www.simplyrecipes.com/recipes/perfect_mashed_potatoes/