Set the Instant Pot on “SAUTE” and add 2 tbsp olive oil.
When the oil is hot, add 1 small diced onion and 1 stalk chopped celery. Cook for about 5-7 minutes, until they are translucent and softened.
Add 2 cloves minced garlic and cook for another minute, then press the “CANCEL” button.
Add 28 oz diced tomatoes, 1 chopped carrot, 1 diced zucchini, 2 bay leaves, 4 cups vegetable broth, 2 cups water, 1 cup shell pasta, 15 oz kidney beans, and 15 oz cannellini beans. Stir and close the lid. Make sure that the venting knob is set to “SEAL”.
Cook for 5 minutes on “HIGH” pressure, then do a quick pressure release.
After the pressure is released, open the lid and stir the soup.
Press again the “SAUTE” button and bring the soup to boil. Add 3 cups chopped kale and 2 cups chopped green beans. Stir and let it cook for another 5 minutes.
Taste the soup and add more salt if needed.