Here's a simple recipe for popular raw chocolate sandwich cookies using Ziploc bags. Mix softened butter, powdered sugar, and egg yolks to make a cocoa dough, flatten it, and chill it in the freezer. Next, make a ganache by adding warm heavy cream and butter to melted chocolate, and chill this in a Ziploc bag until firm. Simply cut the chilled dough and ganache, bake, and sandwich them together to create moist and rich, delicious cookies. They're convenient to carry and perfect as a gift or for enjoying at home.