Creating Italian Penicillin Soup is straightforward. Follow these simple steps to bring this delightful dish to life:

1. Heat the Oil: In a large pot, heat the olive oil over medium heat.
2. Sauté Aromatics: Add chopped onion and minced garlic. Sauté until the onion is translucent, about 5 minutes.
3. Add Vegetables: Stir in the chopped carrots and celery. Cook for another 5 minutes until they start to soften.
4. Incorporate Zucchini and Green Beans: Add the diced zucchini and green beans. Cook for an additional 3-4 minutes.
5. Add Tomatoes and Broth: Pour in the diced tomatoes with their juice and the broth. Stir to combine.
6. Season the Soup: Add oregano, basil, bay leaf, salt, and pepper. Bring the mixture to a boil.
7. Simmer: Once boiling, reduce the heat to low and let the soup simmer for 30 minutes. Stir occasionally to prevent sticking.
8. Add Pasta (if desired): If using pasta, add it to the soup during the last 10 minutes of cooking.
9. Remove Bay Leaf: Before serving, don’t forget to remove the bay leaf from the soup.
10. Garnish and Serve: Ladle the soup into bowls, garnish with fresh parsley, and sprinkle with grated Parmesan cheese.

Following these steps will guide you in creating this incredible soup effortlessly.