Yield:
6 servings
Combine broth, potatoes, onion, celery, flour, salt and pepper in slow cooker; mix well. Cover; cook on LOW for 6-7 hours. Stir in half and half; cover and cook for 1 hour.
Slightly crush potato mixture with potato masher. Continue to cook, uncovered, an additional 30 minutes until slightly thickened. Just before serving, stir in butter and parsley.
TDS 3