Preheat the oven to 350 degrees.

Combine the dry ingredients and set aside.

In the bowl of a stand mixer, cream the butter and sugar until smooth and well combined, about 2-3 minutes. Add the egg and extract and cream until combined. Add the dry ingredients and stir on low just until combined.

Dump the dough crumbles out on to a lightly floured surface and work together into one ball with your hands. Using a rolling pin, roll the dough to just over ¼″ thicken and use a medium sized cookie cutter to cut shapes. If the dough ever gets too soft, refrigerate briefly.

Place shapes on a baking sheet and freeze briefly for about 5 minutes.

Once chilled, bake in the preheated oven for 10-12 minutes and then cool on a cooling rack. Allow cookies to cool completely prior to icing.

Sift or whisk powdered sugar to remove lumps.

Add 3 tablespoons of the milk and the extract, whisking until combined. Continue to add milk until it is the right viscosity. You will want thicker frosting for piping. To test viscosity, run your whisk or a knife through the bowl of frosting- your frosting should slowly move back together until you can’t see any trace of the whisk any longer. This process should take about 10 seconds. If the frosting is too thick, it will not pool back together, and if it is too thin, it will pool back together too quickly. The ten second test doesn’t lie. Add more milk for a thinner icing and more powdered sugar if your icing becomes too thin.

Cover tightly in a tupperware or with a wet paper towel if you are not using it immediately, as frosting will dry out and become clumpy. Whisk occasionally and add more milk if it becomes too thick.

Divide the glaze into three bowls. Add gel food coloring to one of the bowls a single drop at a time. It is important to not add too much as it is easier to darken the glaze than it is to lighten it. I keep one bowl of glaze white and dye the other two bowls grey and black.

Pour a small bit of white glaze into the bottom of a bowl just big enough for your cookies. Drizzle a small bit of grey, black, or both glazes and barely swirl with a toothpick or knife. Carefully dip the tops of the cookies into the glaze and allow any excess to drip off. You can further “marble” the cookies by tilting them side to side. Place the cookies on a cooling rack or wax paper and allow to set completely. It will take about 4-6 hours for the glaze to set up completely. Be sure that they are completely dry before storing in a tupperware or cookie box!