Heat olive oil in a large pot over medium heat.
Add the diced onion and sauté until translucent, about 5 minutes.
Stir in the minced garlic and cook for another minute.
Pour in the crushed tomatoes and vegetable broth, then stir well.
Season with basil, oregano, salt, and pepper. Bring to a boil.
Reduce heat and let it simmer for 15 minutes, allowing flavors to meld.
Add the tortellini and cook according to package instructions, typically 3-5 minutes.
Taste and adjust seasoning if necessary prior to serving.
Ladle the soup into bowls and garnish with fresh parsley, if desired.