For the filling, follow the instructions for my Easter cake.
To assemble: take two cookies of similar size and turn one upside down so the flattest part is facing you. Pipe or spread the frosting over and then place the other cookie on top. Sprinkle with a little icing sugar and enjoy!
Disclaimer: I use metric measurements for my ingredients. To help out American readers, I have used online sources to convert to cups. However, as these have not been verified by me, I am unable to guarantee complete accuracy.