Crock Pot Potato Soup w/Ham

5 pounds peeled & sliced potatoes
1 small onion, chopped
2 tablespoons butter
2 chicken bouillon cubes
2 tablespoons dried parsley
water (enough to cover the potatoes)
2 cups milk
1/2 cup flour
1 cup diced ham

Put potatoes, onion, butter, bouillon, parsley & water in crock pot. Cook on low 6 hours. 30 minutes before serving, mix the milk & flour together and add to soup. Add 1 cup diced ham. Cook 30 minutes or until thickened.