Brown the sausage in a pan. Place cooked Italian sausage, chicken broth, water, garlic, potatoes and onion in slow cooker. Cover and cook on High for 3 to 4 hours until potatoes are cooked and soft. Optional: Mash the potatoes a bit with a potato masher for texture. Turn the crock pot off and add the kale. Return the lid and let sit for 5 minutes. Add whipping cream and season to taste with salt, pepper, and any other desired spices. Serve.