Scalloped Potatoes

Description
Scalloped potatoes are sure to be a hit with any crowd. This recipe may be doubled for a 5 to 6-quart crockpot.

Ingredients

 * 7 to 9 medium potatoes, thinly sliced, about 2 pounds or 4 to 5 cups
 * 1 cup cold water
 * ½ teaspoon cream of tartar
 * 3 tablespoons butter
 * 1 medium onion, thinly sliced
 * ¼ cup all-purpose flour
 * 1 teaspoon salt
 * ¼ teaspoon ground black pepper
 * 1 can (10¾ ounces) condensed cream of mushroom soup
 * 4 ounces American cheese, slices or shredded (Outside the United States other processed cheese or cheddar cheese may work. I haven't tried it.)

Directions

 * 1) Toss potato slices in 1 cup water and ½ teaspoon cream of tartar, then drain.
 * 2) Put half of sliced potatoes in a buttered or greased 3½ to 4-quart slow cooker.
 * 3) Top with half of onion slices, half of the flour, half of the salt and half of the pepper.
 * 4) Dot with half of the butter.
 * 5) Repeat layers; dot with remaining butter.
 * 6) Spoon soup over the top.
 * 7) Cover and cook on low 7 to 9 hours, or 3 to 4 hours on high.
 * 8) Add cheese about 30 minutes before serving.