Preheat oven to 350. Brown beef.
While beef is browning, slice tops off of peppers and remove seeds and membranes. Place peppers in a 13 X 9 baking dish. Set aside.
When beef is brown, add sauce, 1 c. water, pasta, olives, and pepperoni. (I also added the chopped tops of the bell peppers, but that is optional). Cook 15 minutes or until pasta is cooked. Stuff peppers with beef mixture. Bake at 350 for 20 minutes. Remove and sprinkle with cheese. Return to oven and bake 10 minutes longer or until cheese melts.