Pour oil into soup pot; add onion and cook 5 minutes. Add broth bouillon cubes, garlic, thyme, soy sauce, salt, parsley, basil, and carrots. Cover and bring to a boil; reduce heat and simmer 30 minutes. Stir in noodles and cook uncovered 10 minutes; add chicken. In separate bowl, stir arrowroot into yogurt; blend well. Add to soup, stirring as needed. Increase heat to boiling and allow soup to thicken a little. Garnish with chopped green onions. ----