Pour over the bone broth, half and half, salt, sugar, herbs and seasonings. Continue to stir and bring to a low boil. Reduce to a simmer and continue to cook until the celery has softened. Between 5 - 8 minutes.
Carefully puree the soup with an immersion blender until smooth. Fold-in the mozzarella chunks and serve immediately with crusty bread and fresh Italian parsley.
Recipe by Slice of Jess at https://sliceofjess.com/the-absolute-best-cream-of-celery-soup/