Creamy Scalloped Potatoes - Crock-Pot Style
["2 lb. potatoes (about 6 medium)", "1 c. water", "1/2 tsp. cream of tartar", "1 small onion, thinly sliced", "1/4 c. flour", "1 tsp. salt", "1/4 tsp. pepper", "2 Tbsp. butter", "1 (10 3/4 oz.) can cream of mushroom soup", "4 slices American cheese"]
["Pare and thinly slice potatoes.", "Toss slices in water and cream of tartar.", "Drain.", "Put half of sliced potatoes in greased crock-pot.", "Top with half of onion slices, flour, salt and pepper. Add remaining sliced potatoes and onions.", "Sprinkle with remaining flour.", "Add butter and undiluted soup.", "Cover and cook on low 7 to 9 hours or high 3 to 4 hours.", "Add cheese slices a few minutes before serving."]
["potatoes", "water", "cream of tartar", "onion", "flour", "salt", "pepper", "butter", "cream of mushroom soup", "American cheese"]