Cook the ground beef and onions in a stockpot over medium heat, crumbling the meat as it browns for about 10 minutes. Stir in minced garlic and cook 2 more minutes.
Stir in tomatoes, vegetable broth, marinara sauce, water, oregano, basil and parsley. Bring to a low boil and simmer for about 20 minutes. Reduce heat.
Add tortellini and continue to cook until pasta is tender, about 10 minutes.
Stir in heavy cream and fresh basil and cook 5 more minutes.