5 Ways to Make Icing – wikiHow

To make vanilla icing, first add 1 cup (125 grams) of confectioners’ sugar to a bowl. Then, add 2 to 3 tablespoons (30 to 45 milliliters) of milk, depending on how thick you want the icing to be. Finally, pour in 1/2 teaspoon (5 milliliters) of vanilla extract, and whisk everything together until the ingredients are fully combined.

https://www.wikihow.com/Make-Icing