Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   2      pound         Potatoes
   1      small         Onion -- thinly sliced
     1/4  cup           Flour
   1      teaspoon      Salt
     1/4  teaspoon      Pepper
   2      Tablespoon    Butter
   1      can           Cream of mushroom soup
   4      slices        American cheese

Preparation:

Pare and thinly slice potatoes. Toss slices in 1 cup water and 1/2 tsp. cream of tartar. Drain. Put half of sliced potatoes in greased crockpot. 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 (200 degrees) for 7 to 9 hours (or, high, 300 degrees, 3 to 4 hours). Add cheese slices about 30 minutes before serving. Recipe may be doubled for 5 quart crockpot.