Creamy Potato Soup
["4 medium potatoes, pared and cut in small pieces", "1 medium onion, chopped", "1 c. celery, chopped", "3 c. water", "1 tsp. salt", "1/4 tsp. black pepper", "3 c. milk, divided", "1 Tbsp. flour", "1 (8 oz.) sour cream", "2 Tbsp. butter", "1 c. cooked ham, chopped"]
["Cook potatoes, onion and celery in water until tender.", "Add seasonings and 2 1/2 cups milk. Blend flour with remaining 1/2 cup milk until smooth. Add to potato mixture and bring to boiling point.", "Cook about 5 minutes.", "Blend in sour cream and butter. Add ham.", "Heat thoroughly and serve immediately.", "Yields 6 servings."]
["potatoes", "onion", "celery", "water", "salt", "black pepper", "milk", "flour", "sour cream", "butter"]