In a large skillet or pot, brown the ground beef over medium heat until fully cooked. Drain any excess fat.
Add the chopped onion, garlic, and green bell pepper to the skillet. Sauté for about 5 minutes, or until the vegetables are tender.
Stir in the diced tomatoes (with juice), tomato sauce, beef broth, elbow macaroni, Italian seasoning, salt, and black pepper.
Bring the mixture to a boil, then reduce the heat to low. Cover and simmer for about 20 minutes, stirring occasionally, until the macaroni is cooked and the liquid is mostly absorbed.
If desired, sprinkle shredded cheddar cheese on top and cover for an additional 5 minutes to melt the cheese.
Serve hot and enjoy!