Both evaporated and condensed milks have undergone more sustained heat treatment to reduce their water content: evaporated milk is then sterilised ... on freezing, so make sure the packaging ...
Put the macaroni and both types of cheese in a slow cooker. Pour over the evaporated milk and add 700ml/1¼ pint of water. Season with pepper and stir. Cover and cook on high for 1½ hours ...