To thicken <g class="gr_ gr_57 gr-alert gr_gramm gr_inline_cards gr_run_anim Grammar only-ins doubleReplace replaceWithoutSep" id="57" data-gr-id="57">soup</g>, if desired, you can add strips of flour tortilla, which will dissolve into the soup to thicken the broth.
To dilute soup, add more chicken broth.
To serve: Ladle into soup bowls. Garnish with crushed tortilla chips, reserved cheese and cilantro to taste.