Pierce potatoes with a fork, and arrange on paper towels. Microwave on high 8 minutes; turn potatoes over after 4 minutes. Cut each potato in half lengthwise, and scoop out the pulp, leaving 1/4-inch-thick shells. Mash pulp with 3 ounces Canadian bacon, 2 tablespoons sour cream, and 2 teaspoons chives in a bowl. Spoon mixture into shells. Sprinkle 2 tablespoons cheese over tops of potatoes. Microwave on high 2 minutes, and sprinkle with 1 teaspoon chives.