These peanut butter sandwich cookies are something special. For starters the filling uses up a whole jar of peanut butter so there are no complaints about a lack of peanut butter flavour. The biscuit is a wholesome mix of wholemeal flour and rolled oats. And don't just take my word for it, they're also "Sleepless in Seattle" writer Nora Ephron's favourite ever cookie. She visited Dahlia Bakery in Seattle and after buying some, wrote to the proprietor Tom Douglas to tell him that they were her all time favourite cookie. He asked if he could name the cookie after her in their upcoming cookbook named what else but "The Dahlia Bakery Cookbook: Sweetness in Seattle."