In large pot or skillet, warm 21 ounces tomato soup, 1-2 cups water and 1 cup half and half over medium-heat. Add in 1 teaspoon Italian seasoning, 1/2 teaspoon garlic powder then simmer on low for 10 minutes.
Add in tortellini and simmer another 10 minutes, or until cooked and tender. If adding 2-3 cups spinach, stir in and allow to cook for one minute.
Ladle into bowls and add parmesan cheese and basil if desired. Enjoy while warm!
Notes
I usually use a 9 ounce package of spinach and cheese tortellini. If you prefer more tortellini to soup, add in a 16 ounce package. If you prefer more soup, then add in 1/2 cup more water.
If you'd like a creamier consistency, add in another 1/2 cup half and half or 1/2 cup grated parmesan cheese.