Boil pierogies as directed on box. Drain. Preheat oven to 400°F. Grease a 10- or 12-inch pizza pan. Arrange 2 pierogies in center of pan, straight sides slightly overlapping. Arrange remaining pierogies around center pierogies, in a concentric circle, slightly overlapping, pressing pierogies together to form a complete circle.
Spread pizza sauce on top of pierogies to cover. Sprinkle with cheese and your favorite pizza toppings. Bake 12 to 15 minutes or until cheese is melted and pierogies are heated through. Cut into wedges to serve.