I use 1 cup powdered sugar to 1tbs corn syrup and 1tbs milk. You can add more/less milk depending on the consistency you need. If it’s too think your icing will not hold on the cookie and look transparent. It holds up well, dries quick and tastes good. When you pour it if there are any bubbles, just pop with a toothpick within the first couple minutes and it will dry a nice shiny finish.