How to make lactose free mashed potatoes To begin with, I use soy cream instead of dairy-based cream.  It tastes alright, but not superb, and it seems to require more salt. What is missing that I should find a substitute to add back in?
By "cream" do you mean "milk?" If you are lactose intolerant, I suggest some margarine and either sour cream or yogurt.  If you have a lactose allergy, still margarine, more alternate dairy products, and some kind of spice mix, like an Italian seasoning.