Preheat oven to 350. Set 1/2 c. cheese aside. Brown beef. While beef is browning, cook pasta according to package directions. Drain. Combine beef, sauce, balsamic vinegar, garlic, salt, pepper, bell peppers, and onions. Add 1 c. sauce mixture to the bottom of a greased 13X9 baking dish. Top with half the pasta. Top with 1 c. cheese. Repeat layers, ending with sauce. Bake at 350 for 30 minutes. Top with reserved cheese. Bake 5-7 more minutes or until cheese melts.