Add all of the ingredients (except the lime juice and salt) to a slow cooker. Stir to combine and cook on low for 8 hours or high for 4 hours.
Remove the lid and use an immersion blender to blend half of the soup. You can also transfer half of the soup to a standing blender, blend it up, and add it back to the slow cooker. Add the lime juice and stir to combine. Taste and add salt as needed.
Add soup to a bowl with optional toppings.
