In a 3. 5- to 4-quart slow cooker, combine the vegetable broth, tomato puree, rinsed and drained beans, uncooked rice, chopped onion, minced garlic, dried basil, salt, and pepper.
Stir everything together to ensure it's well mixed.
Cover the slow cooker and cook on the low-heat setting for 5 to 7 hours or on the high-heat setting for 2. 5 to 3. 5 hours, until the rice is tender.
Just before serving, stir the chopped kale into the hot soup. The residual heat will wilt the kale perfectly in just a few minutes, keeping it vibrant and tender-crisp. Ladle into bowls and, if desired, sprinkle each serving with vegan Parmesan cheese.