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How To Thicken Icing

How To Thicken Icing

If your icing is too runny don’t throw it out! There are some tried and true methods for thickening your icing and you can do it with what you likely already have in the pantry. Let’s get right to it.

Best Way To Thicken Icing

Powdered Sugar: The most common way to thicken icing is to gradually add more powdered sugar while mixing. This will thicken any frosting quickly and easily. It is as simple as adding a tablespoon at a time while mixing until your desired consistency is reached.

But what if you are out of powdered sugar or just don’t want to increase your icing sweetness?

How To Thicken Icing Without Powdered Sugar

Add Flour

All purpose can be used as an icing thickening agent for any icing that is baked. If not baked it will alter the flavor of your icing.

To thicken icing with flour simply add one tablespoon of all-purpose flour to your icing while hand whisking or mixing until the desired consistency is reached.

Add Cornstarch

Cornstarch can be used for thickening any runny icing. While hand whisking or using an electric mixer, add a half a tablespoon at a time until desired consistency is reached.

Completely blend your added cornstarch before adding more to avoid getting an icing that is too thick.

Add Butter

Butter works well for thickening up a thin icing. While mixing or whisking, add one tablespoon of softened butter at a time.

Continue until icing has reached your desired consistency. This method works well for icing being added to cakes and cupcakes.

Add Whipped Cream

This method works well for adding some sweet while thickening your icing. Add 2 tablespoons at a time while mixing or whisking until desired consistency is reached.

Add Gelatin

Only use unflavored gelatin unless you wish to add flavor to your icing. While mixing or hand whisking add 2 tablespoons of gelatin at a time until icing reaches desired thickness.


Congratulations, you have just learned how to thicken icing! Hopefully this article helped you to better understand the various ways of thickening your icing.

If you have a favorite thickening ingredient, don’t hesitate to share in the comments below.

Best Of Luck To You !!!