Place potatoes and garlic in a large saucepan; fill with enough water to cover them.
Set pan over high heat; bring to a boil. Boil until potatoes are fork-tender, about 8 minutes; drain and return potatoes and garlic to pan. Add sour cream to pan; stir and then mash mixture until almost smooth (or desired consistency). Stir in buttermilk. Fold in parsley; season to taste with salt and pepper. Yields about 3/4 cup per serving.
You may also use red potatoes—unpeeled for color—or Yukon Golds—for a natural buttery flavor. Feel free to swap plain low-fat yogurt or cottage cheese for the sour cream, if you prefer.
PointsPlus Value: 5