Peel, and dice your potatoes in a small dice. Add potatoes, garlic, onion, black pepper and chicken broth to slow cooker.
Cook on LOW for 8-10 hours or HIGH for 5 hours without opening the lid during the cooking time. You'll want to cook this until the potatoes are tender.
Add the cream cheese to the slow cooker, you can cube it if you like, but it's not nescessary. Using an immersion blend up the soup. If you don't have an immersion blender you can use a regular blender, you will need to blend the soup in batches.