Set a large pot on medium heat. Once hot, add the oil and onions. Cook for 3 – 5 minutes until the onions are brown and somewhat translucent. Add the garlic, oregano and sage and cook/bloom for 1 minute until fragrant. Pour in the chicken broth and bring to a simmer.
Add the carrots, celery, potatoes and chicken, then cover and cook for at least 20 minutes, up to 30 minutes (if you have the time). Ensure the lid is on tightly to avoid as much evaporation as possible.
Add the tomatoes, cabbage, thyme and bay leaves along with a generous pinch of sea salt & pepper. Cook for 1 hour.
Garnish with thinly sliced chard (or other leafy green) and herb of your choice like dill or even basil.
Enjoy!