How to add body to vegetable soup?
How to add more body to a soup?
Blend all or part of it. If you've made a broth with chunks of vegetable in it, such as minestrone soup, then pour the soup through a sieve.
Add cream or yogurt. 
Add flour or cornflour. 
Use a butter and flour paste. 
Blend in bread.
Add lentils or rice.