I love mashed potatoes, and discovered a way to "stretch" them:
Boil your potatoes - 15 minutes before they're done, add some cauliflower. When both veggies are tender, drain the water, add some chicken broth, skim milk, Butter Buds and pepper. Mash until you have a smooth texture.
You can figure out the points based on how many potatoes you used - the cauliflower is a freebie. Enjoy!