Poke each potato with a fork a few times. Place on a baking sheet lined with foil and bake for 45 to 50 minutes, until they are easily pierced with a knife. Wrap them loosely in the foil for 5 minutes or until ready to serve.
If using regular yogurt, place it in a strainer lined with paper towel and set the strainer over a bowl. Let the yogurt drain and thicken for 20 minutes.
Combine the Greek-style yogurt or regular thickened yogurt, the oil, parsley and chives of the in a small bowl.
Slice the potatoes in half lengthwise and dollop a tablespoon of the creamy herb topping on each half.