My 8-year-old had one of these somewhere recently and decided she wants to have them be the birthday treat she brings to her classroom. I've never made them, or even had one. Anyone have a good recipe that isn't going to drive me crazy? I'm a little worried about the frosting part; I don't have a pastry bag and I'm not known for being good at frosting cakes. I need it to make at least 20 cookies. Also, will I be able to stack them for transport?