In a large skillet, cook beef over medium heat, stirring occasionally to break up clumps, until brown all over. Drain.
Increase heat to high, add onion and green pepper and cook for 5 minutes, stirring. Add tomatoes, Worcestershire sauce,oregano and salt. Bring to a boil, lower heat to low and simmer, uncovered, while bringing a large pot of water to boil.
Preheat oven to 350° (F), Boil noodles according to package directions; drain.
Return noodles to pot and stir in ground beef mixture. Pour into a casserole dish, and top with cheese. Cover and bake until cheese melts, about 10 minutes.