
Add all ingredients except the olive oil and white wine vinegar to the slow cooker. Cover and cook on low for 6-8 hours or on high for 3-4 hours, until the lentils are tender.
Discard the bay leaf and carefully ladle out about 4 cups of the soup into a large blender. Add the olive oil, cover, and pulse a few times until semi-smooth and creamy looking.
Pour the blended soup into the crockpot and add the white wine vinegar. Stir to combine, taste, and season with more salt as needed.
Serve with desired toppings like chopped cilantro, sour cream, shredded parmesan, and crusty bread.