Crockpot Ham and Potato Soup...

8 cups potatoes (peeled and diced)
1/2 yellow onion chopped
2 large carrots (peeled and chopped)
1/2 cup chopped celery
16 ounce cubed ham
1 tsp. salt
1/4 tsp. pepper
4 cups chicken broth
3 Tbsp cornstarch
1 1/2 cups heavy cream
1/2 cup sour cream
grated cheese to top each bowl of soup with

In crockpot add potatoes, onion, carrot, celery, ham, salt, pepper, and chicken broth.  Cook on low for 7-8 hours or on high for 4-5 hours.  15 minutes before eating, Take out 1/3 of the potatoes and put in a bowl.  Mash with a potato masher and then add back into the soup.  Add cream and sour cream and stir well.  In a separate cup put 3 tbsp cornstarch and a little bit of water to make a smooth mixture.  Add to crockpot.  Cook for an additional 15 minutes.  Serve with a green salad and roll.