Learn how to make sugar cookie icing that hardens into a glossy, shiny glaze. This easy sugar cookie icing recipe only uses 4 simple ingredients and takes 5 minutes to make!
The trick for how to make hard icing is in the ingredients. A mixture of powdered sugar, milk, and corn syrup blends together to make smooth, perfect sugar cookie icing.
The small amount of corn syrup achieves a shiny, glossy surface, and thickens the frosting to make for easier decorating. When it dries with the milk and powdered sugar, you are left with hard sugar cookie icing.
Since there is no butter or fat in the recipe, this icing will harden similar to royal frosting. But unlike royal icing, which uses egg whites or meringue powder, the ingredients are simple.
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