Line a large plate with 3 sheets of paper towel, and set aside. In a large, heavy-bottomed pot over medium heat add the Italian sausage and use a wooden spoon to break the meat apart into chunks. Cook until browned and completely cooked thru, about 5-6 minutes.
Increase the heat to medium-high and add the onion and cook until translucent and starting to brown on the edges, about 4 minutes. Add the garlic and cook until fragrant, about 30 seconds.
Add the chicken broth, tomatoes, beans, tortellini, Italian seasoning, and salt and pepper and increase the heat to high. Bring the mixture to a low boil, and then reduce the heat to low and cook for 8 minutes. Stir in the sausage, cream, Parmesan, and basil and cook for 2 additional minutes.
Ladle soup into bowls and garnish with shredded Parmesan cheese and chopped basil.