not to eat in one sitting.
when the cookies have cooled, it’s time to prepare the icing. i like to do this in a glass, 4-cup measuring cup because i can microwave the milk in it first (about 30 seconds was all it needed), and because the pour spout makes it easy to ice the cookies. whatever vessel you choose, whisk together the warm milk, corn syrup, and vanilla extract until they are fully-combined. be sure to swirl the mixture in the bowl so that you can see that all of the corn syrup is getting mixed in and not just sitting on the bottom.
now, one cup at a time, whisk 