Preheat oven to 350°. Cook mostaccioli according to package directions for al dente; drain. Meanwhile, in a small bowl, mix eggs and ricotta cheese., In a 6-qt. stockpot, cook beef and onion 6-8 minutes or until beef is no longer pink, breaking up beef into crumbles; drain. Stir in brown sugar and seasonings. Add pasta sauce and mostaccioli; toss to combine., Transfer half the pasta mixture to a greased 13x9-in. baking dish. Layer with ricotta mixture and remaining pasta mixture; sprinkle with Romano cheese. Top with meatballs and Parmesan cheese., Bake, uncovered, 35-40 minutes or until heated through. If desired, top with parsley.