Heat oil in a large pot over medium heat. Add celery, onion, garlic and carrots and sauté for 2-3 minutes or until onions are tender.
Add chicken, chicken broth, salt, pepper and thyme and mix until combined then bring to a boil. Once boiling, stir in gnocchi and boil for 3-4 minutes. Reduce heat to low and let simmer for 10 minutes.
Stir in milk, yogurt and spinach and cook another 2- 3 minutes or until spinach is wilted.