Cook pasta according to package - 9 minutes. Drain. In a large bowl, stir together hot pasta, 1 ? cups sauce, ricotta, mozzarella, parsley, egg, oregano, garlic powder, salt and pepper.
In 13 x 9 x 2" baking dish, spoon pasta mixture; top with remaining 1 ? cups sauce. Sprinkle with parmesan cheese, cover with foil. Bake 30 minutes at 375?.
Make ahead - same as above, do not bake. Cover with plastic wrap, then foil. Refrigerate 24 hours or freeze 2 months. Thaw frozen version in fridge overnight. Remove plastic wrap, replace foil. Bake as directed - add 10 minutes.