Step 1

Mix all the ingredients together in a bowl with a fork, until you get a smooth paste.

Step 2

The icing should be fairly thick but should still flow easily.

Step 3

Fill a piping bag with this border icing.

Step 4

First draw an outline on your cookies, like a border. I would do the outline on all your cookies first.

Step 5

When all the borders are done, it's time to "colour it in". Start with the cookies you outlined first in roughly the same order, this will ensure that the outlines have dried and hardened slightly.

Step 6

Lighten the icing with half a teaspoon liquid (water or milk), mix well, then just fill another piping bag with this icing.

Step 7

Basically, fill all your outlines with this "flood icing", using the tip of the piping bag to push the icing to the edges and corners.

Step 8

While this flood icing is still wet, you can create swirls and patterns by using a toothpick and pulling and swirling the the icing. See the cookies here.