There is a book category 'Crockpot and Slow Cooker' though not for recipes. On the new version of the website, which we are finalizing now and should go live within a couple of weeks, you will be able to search for recipes in bookmarks for books. So you would bookmark your slow cooker books as Slow cooker and then only search in those books when you are looking for those recipes. You can also set up a separate slow cooker bookmark for recipes and add recipes to that.