Preheat oven to 375 degrees. Lightly spray a baking sheet with nonstick cooking spray.
Cut each potato in half lengthwise. Using the small side of a melon ball scoop, cut a ball out of the center of each potato half.
Slice a very thin sliver off the bottom of each potato to keep them from rolling around in the pan. Place potatoes on baking sheet, skin-side down, and spray lightly with cooking spray.
Bake uncovered 30-35 minutes until potatoes are tender.
While potatoes are baking, combine remaining ingredients in a small bowl. Mix well and set aside.
When potatoes are tender, remove from oven and set the oven to broil. Fill the hole in each potato with yogurt mixture. Place potatoes under the broiler for a few minutes, until cheese is hot and begins to brown.