Saute onion and garlic until fragrant. Add vegetables and saute 4-5 minutes.
Add your liquids as well as seasonings and bring to a boil.
Add shredded chicken if you like, then reduce to a covered simmer for at least 20 minutes or up to a few hours.
Serve immediately or store in the refrigerator!
If you would like to add noodles to this soup, I recommend making and storing them separately or adding more broth/water as they will absorb some of your base.