Add the bell peppers, celery, carrots, and green beans to the pot. Stir and cook for an additional 5 minutes until slightly softened.
Combine Ingredients:
Stir in the chopped cabbage, diced tomatoes (with their juice), and vegetable broth. If you like, add paprika, dried oregano, salt, pepper, and red pepper flakes to taste.
Simmer the Soup:
Bring the soup to a boil, then reduce the heat to low. Cover and let it simmer for about 25-30 minutes, or until all vegetables are tender.
Adjust Seasonings and Serve:
Taste the soup and adjust the seasonings as needed. Serve hot, garnished with fresh herbs if desired.