Preheat a 5 1/2 qt dutch oven or soup pot with olive oil over medium heat. Add the chopped onion, carrots, and celery into the pot. Sauté the veggies until softened.
Add the ground beef, breaking it apart as you go. Cook it until it turns golden brown.
Stir in the diced tomatoes, minced garlic, tomato paste, potatoes, and beef broth. Season with Italian seasoning, salt, and pepper.
Bring the soup to a boil. Reduce the heat and simmer for 30 minutes or until potatoes are tender. Season to taste and serve garnished with chopped parsley.