Heat oil in large pot over medium heat.
Add onion and garlic, cook for 3 minutes.
Add carrots, celery, and potatoes to pot.
Cook vegetables for 5 minutes, stirring occasionally.
Pour in vegetable broth and diced tomatoes.
Add kidney beans and green beans now.
Season with thyme, salt, and pepper.
Bring mixture to a boiling point.
Reduce heat and simmer for 25 minutes.
Stir occasionally to prevent sticking.
Taste and adjust seasoning if needed.