Utz Quality Foods is recalling certain Zapp's and Dirty brand potato chips across the U.S. due to concerns that a seasoning ingredient may be contaminated with Salmonella. The problem is believed to be from a batch of dry milk powder used in some chips, which tested negative for the salmonella before being used. So far, no one has been sickened by the product. The recall only affects specific Zapp’s and Dirty products sold nationwide.