Arrange in circle on rack in microwave (if size of potatoes varies, place larger ones outside the ring and smaller ones inside).
Cook on Roast (70 percent power) until potatoes are soft on outside but still firm in center, about 20 minutes.
Cover and let stand in microwave 3 to 4 minutes to equalize moisture and finish cooking.
Potatoes can be cooked in advance and reheated on Roast (70 percent power).
Allow 1 to 2 minutes per potato to reheat.