2 cups powdered sugar
2 to 3 tablespoons milk or water
1 tablespoon light corn syrup
1/2 teaspoon vanilla extract
Pinch of salt
Whisk powdered sugar, milk or water, corn syrup, vanilla, and salt until smooth
Add more liquid for thinner icing
Add more powdered sugar for thicker icing
Use immediately or cover to prevent drying
Spread or pipe onto cooled cookies
