Cookie Periodic Table aka. "The Periodic Table of Aliments"

Step 7 Cut cookies to size

Once the icing is completely hard it's time to make cookie tiles. Take each iced cookie rectangle and cut the edges square using a good sharp knife. Measure a 2" grid, scoring the icing with a knife or a pin to create guide lines. If you are cutting through one of the chocolate topped cookie rectangles then be careful not to let the chocolate break into uneven pieces as you cut (cutting through cold chocolate is hard). To prevent cracks let it warm up a bit before you try to cut it and use more of a sawing motion to whittle through the top layer of cold chocolate. However while cutting sugar icing or the cookie itself use firm downward strokes to minimize crumbs and tearing.

If you store the cookie tiles at this point, be sure to insert layers of wax paper between the cookies! If the icing is at all tacky the cookies will stick together and ruin the shiny finished look of the topping.