Sauté the first 4 ingredients in oil in a large Dutch oven (big pot or pan). Stir in flour, oregano and thyme. Gradually add chicken broth, potatoes and salt. Bring to a boil, reduce heat and cook for 15-20 minutes, until potatoes are tender. Add chicken and noodles and simmer 10 more minutes. Reduce heat and add milk. Do not boil.