In a large saucepan or stock pot, heat the olive oil over medium heat. Add chicken, onion and celery, and saute until chicken is cooked through and onions are softened, about 5 minutes. Add peanut butter, and stir until evenly distributed..
Stir in seasonings, broth, pumpkin and cheese. Simmer for 30 minutes. Serve garnished with chopped peanuts and small sprigs of thyme.