Place a large pot over medium heat and spray with olive oil. Cook leek, celery, carrot and garlic and cook for 1-2 minutes, or until just softened. Add the dried herbs to the pot and cook for another 1-2 minutes until fragrant.
Add tomatoes, cannellini and red kidney beans, quinoa, vegetable stock and water to the pot and bring to the boil. Reduce heat and simmer, partially covered, for 20-25 minutes or until quinoa is cooked through and soup has thickened. Stir through kale.
Divide the soup between 4 bowls and serve with cracked pepper.