How to Make Mashed Potatoes Everyone should know how to make mashed potatoes.  Potatoes are a basic frugal cooking ingredient that will allow you to stretch your grocery budget while adding nutrition to your menu plan.  Follow the directions in our step-by-step tutorial / recipe below to learn how to cook mashed potatoes.  We’ve also included a simple how-to video at the end for the readers that learn best by watching demonstrations. The amount of potatoes and milk will be determined by how many people you are feeding and how many servings you need to make.  I recommend starting with 10 medium-sized potatoes for a family of four; but you…