In a large pot or Dutch oven, cook the ground beef over medium heat until browned. Drain any excess grease.
Add the diced onion, bell peppers, and garlic to the pot and cook until the vegetables are softened, about 5 minutes.
Stir in the diced tomatoes, tomato sauce, chicken broth, cooked rice, and Italian seasoning. Season with salt and pepper to taste.
Bring the soup to a boil, then reduce heat and let simmer for 30 minutes.
Serve hot, garnished with chopped fresh parsley.