Crockpot Reuben Casserole

1 pkg. (8oz.) noodles, cooked
1 can corned beef
3 1/2 cups sauerkraut, drained  
6 slices American cheese
16 oz. sour cream
1 can(10 1/4oz) cream of chicken soup, undiluted
6 slices Swiss cheese

Coat a 4-quart crock pot with non-stick spray, layer in order given, half the noodles, half the meat, all of the sauerkraut, and all the American cheese. Mix the sour cream and the chicken soup together and layer with half of the soup mixture. Repeat, layering the rest of the noodles, meat, soup mixture and then lastly the Swiss cheese. Cook on HIGH for 2 hours, so that it bubbles well. Turn down to LOW for 1 or 2 hours. It helps to stir before serving, to mix the layers together some.