Mix potatoes, sauce mix, ham, broth, celery, onion, pepper in crock pot. Cover and cook on low heat 7 hours. Mix half and half with the flour, gradually stir flour mixture into chowder until blended. Cover and cook on low one more hour stirring occasionally until thick. I think this is too thick, so use the big can of chicken broth, maybe 42 ounces - not sure on that. And instead of half and half, I use regular milk, 2 % at our house.