My mom cooked this for us growing up and now I make it for my family. If you want to omit the peppers and onions due to picky eaters or cost, try adding Italian seasonings such as basil and oregano to the ground beef for added flavor.
Saute the green pepper and onion in a large pot until tender. Add ground beef, salt, black pepper and garlic powder. Cook until the ground beef is browned and no longer pink. Drain.
Prepare macaroni according to package directions, salting the water liberally before boiling. Drain and combine with ground beef in a large baking dish. Stir in tomato sauce and tomato paste and mix well. Cover top with cheese and bake for 25 minutes.