In a 6-qt. stockpot, bring broth to a boil. Carefully drop sausage by heaping teaspoonfuls into boiling broth. Add tortellini, tomatoes and Italian seasoning; return to a boil., Reduce heat; simmer, uncovered, 8-10 minutes or until sausage is cooked through and pasta is tender. Stir in spinach until wilted. Freeze option: Freeze cooled soup in freezer containers. To use, partially thaw in refrigerator overnight. Heat through in a saucepan, stirring occasionally and adding a little broth if necessary.