Mashed Potatoes With Rosemary and Leeks

2 whole garlic heads 2 lbs cubed peeled yukon gold potatoes 1 cup chopped onion 2 tablespoons plain fat-free yogurt or 2 tablespoons nonfat sour cream 1[...]

2 whole heads of garlic 2 lbs yukon gold potatoes , cubed, peeled 1 cup onion , chopped 2 tablespoons yogurt , plain, fat-free 1 teaspoon dried rosemary ,[...]

2 lbs potatoes , cut in cubes (peeling optional) 1 tablespoon olive oil 1 tablespoon garlic clove , minced 1 small leek , white part only, chopped 1[...]