Arrange potatoes on microwave dish. Pierce with a fork in a few places. Microwave, uncovered, for about 10 minutes at high power. Rearrange potatoes after 5 minutes, turn them over. Place potatoes on counter, cover with a bowl and let stand for at least 7 minutes (potatoes will continue to cook). Combine butter and green onions in a microwave safe dish. Microwave covered at high power for at least 1 1/2 minutes or until onion is soft. Place bacon on paper towel on a microwave safe dish. Microwave, covered with paper towel at high power for 4-5 minutes or until almost crisp. Let stand for a minute. Crumble. Cut potatoes in half, scoop out pulp. Mash potatoes with butter and green onion mixture, milk or Half and Half and seasonings until light and fluffy. Add bacon. Spoon potato mixture into shells. Arrange on microwave safe dish. Sprinkle with cheeses. Microwave, uncovered at high power for about 5 minutes or until potatoes are hot and cheeses are melted. Rotate the dish after half the cooking time if the microwave oven is not a rotating one.