Yes, you can. First, core and quarter the apples (no need to peel them) and place them in the slow cooker. Make the spice sachet as shown in the pictures. Then add the fresh or frozen cranberries, apple juice, apple cider vinegar, brown sugar, and kosher salt to the slow cooker and stir to combine. Nestle in the spice sachet, cover the slow cooker, and cook on high for 4 hours, stirring twice. When it's ready, remove the spice sachet and puree the cranberry applesauce with an immersion blender, food processor, food mill, or blender.