Place potatoes in a saucepan; cover with water. Bring to a boil. Reduce heat, and simmer 10 minutes or until tender; drain. Place potatoes in a large bowl; mash with a potato masher or fork until smooth. Add chives and next 5 ingredients (chives through 3/4 teaspoon salt); blend well with potato masher.
Divide Pierogi Dough into 16 equal portions, shaping each into a ball. Working with one portion at a time (cover remaining dough to prevent drying), roll each ball into a 3 1/2-inch circle on a lightly floured surface.
Spoon 1 rounded tablespoon of the potato mixture onto half of each dough circle. Bring opposite sides of dough circle together; pinch to seal, beginning with center and pinching down both sides to form a half-moon shape. Repeat with the remaining dough circles and potato mixture.
Bring 2 quarts water to a boil in a large saucepan. Add half of pierogi; cook 7 minutes or until done (pierogi will rise to the surface). Remove pierogi with a slotted spoon; drain in a colander (pierogi will stick to a paper towel). Place pierogi in a single layer on a baking sheet or platter. Repeat procedure with remaining pierogi.
Heat 1 1/2 teaspoons butter in a large nonstick skillet over medium-high heat. Add 8 pierogi; cook 2 minutes on each side or until golden brown. Remove pierogi; keep warm. Repeat procedure with remaining 1 1/2 teaspoons butter and 8 pierogi. Sprinkle cooked pierogi with 1/8 teaspoon salt. Serve with 1/3 cup reduced-fat sour cream.
Note: Nutritional analysis includes Pierogi Dough.