In a large stock pot, heat avocado oil over medium heat. Add onion, garlic, carrots and celery and sauté until vegetables are tender, approximately 6 minutes.
Add herbs and cook for another minute. Add tomatoes, vegetable broth, sea salt and cooked beans. Bring to a boil. Reduce heat to low and simmer soup covered for 10 minutes.
Add spinach and cooked brown rice (if using). Simmer uncovered until spinach wilts, a few minutes more. Taste and adjust seasoning.
Source: Tracy Bechtel Wellness