01 -
Stir together powdered sugar, 5 tablespoons milk, corn syrup, and vanilla till the mixture feels silky.
02 -
Slowly mix in a bit of milk until a ribbon of icing collapses after 3-4 seconds. Pull out one-third for outlining.
03 -
For the rest of the icing, stir in extra milk until it melts into the rest of the bowl right away.
04 -
If you want, mix food coloring into both batches of icing for creativity.
05 -
Draw outlines first with the thick icing, then flood the inside with the thinner version. Fill gaps using a toothpick if needed.
06 -
Leave the cookies untouched to dry for 20 to 24 hours if stacking them.