HEAT oven to 400ºF. Place potato on microwaveable plate. Prick in several places with fork. Microwave on HIGH 7 to 8 min. or until tender.
CUT potato in half lengthwise. Scoop flesh into bowl, leaving thin shells; mash with cream cheese spread, sour cream and 2 Tbsp. Cheddar. Spoon into shells; sprinkle with remaining Cheddar.
BAKE 10 min. or until cheese is melted and potatoes are heated through.
