In a large pot, heat the olive oil over medium heat. Add the diced onion and sauté for about 3-4 minutes, or until it becomes translucent.
Stir in the minced garlic and cook for an additional 1-2 minutes until fragrant.
Pour in the crushed tomatoes and vegetable broth, then add the dried oregano, dried basil, and some salt and pepper. Bring the mixture to a simmer.
Once simmering, add the tortellini, stirring well to combine. Allow to cook for about 5-7 minutes, or until the tortellini are tender (cooking time may vary depending on if using fresh or frozen).
Reduce the heat to low, and stir in the heavy cream and chopped fresh basil. Mix until everything is combined and heated through.
Taste and adjust the seasoning if needed with more salt and pepper.
Serve hot, topped with grated Parmesan cheese and extra basil if desired.