Add olive oil, celery, onion, carrots, and green beans, to the bowl of a large slow cooker,
Stir in diced tomatoes.
Add garlic paste, bay leaves, Italian seasoning, black pepper, and salt.
Pour in vegetable stock.
Stir to combine.
Close the lid and cook on a low setting for 5-6 hours or on a HIGH setting for 3-4 hours.
Once the timer beeps, uncover the soup. Carefully remove the bay leaves and discard them.
Add kidney beans and stir to combine. Cook on HIGH for another 30 -45 minutes.
Unplug the slow cooker, and add Maraconi pasta to the soup.
Cover the slow cooker and let the soup rest until the pasta is all cooked and tender.
Add water to adjust the soup consistency.
Serve hot and enjoy this filling soup with a crispy slice of focaccia bread!