Heat a large dutch oven over medium heat. Add oil.
Add onion, carrots, celery and saute for 5-8 minutes, stirring occassionally, until softened.
Add garlic and saute 1-2 more minutes.
Add broth, beans, chicken and bring to simmer. Cook for 10 minutes. Salt and pepper to taste.
In the last few minutes of cooking, add in the greens, cover and cook until wilted.
Can be frozen for up to 1 month.