Best Cookie Cake Icing

This tried-and-true cookie cake icing is the perfect consistency for piping onto cookie cakes, it has that classic bakery flavor, and it's easy to whip up whenever you need it. It's truly the best cookie cake frosting ever!

Use it on my traditional chocolate chip cookie cake as a quick border or cover the whole thing to make a themed cookie cake (baseball cookie cake, anyone?).

Best Piping Tip for Cookie Cakes

I like to use a large star piping tip when piping frosting onto the border of a cookie cake.

It's super easy to use & makes your cookie cakes look like they came from a bakery! If you don't have the cake decorating skills to write or pipe an elaborate design, this tip lets you get a professional look with practically no effort at all.

Second, it's just the right size for this cookie cake frosting recipe. The frosting is thick and stiff, so the large tip works well. If you try to use it with a smaller star tip, you may have trouble with it coming out.

How to Decorate a Cookie Cake

I like to make cookie cake icing stiffer vs. super fluffy, which means it holds its piped shape & hardens better. This makes your frosted cookie cake easier to serve, slice, and store. The frosting doesn't get crunchy, but it does develop a thin crust.

Here are some fun cookie cake frosting ideas anyone can do:

• Add border: Use the large star piping tip above to create a simple border. You can leave this as-is, or add sprinkles.
• Color it! Color it with Wilton gel for a pretty hue. See my trick for getting pastels in my How to Make Light Pink Frosting post.
• Use stencils: Use the printable number stencils from my Giant Birthday Cookie Cake.
• Sprinkles: Frost the whole cake with an offset spatula and add sprinkles to the top.
• Add phrases! Get a letterboard cake topper kit to make adding a message to your cookie cake super easy!

If you're making a giant cookie cake recipe in my DIY Cookie Cake Pan, I recommend removing the edges before you decorate it!

Frosting Variations

Not only is this the best icing for cookie cakes, it's also the most customizable! Here are some of my favorite ideas:

• Funfetti: Add sprinkles on top or use my chewy funfetti cookie cake recipe, if you want something even more festive!
• Cookies & Cream: Mix Oreo crumbs into the vanilla frosting, like in my oreo cookie pizza.
• Lemon: Add ½ -1 teaspoon of lemon extract or use the frosting recipe in my lemon cookie cake (developed for a sugar cookie cake!).
• Vanilla Almond: Use this on a Frosted Sugar Cookie Cake.
• Chocolate: If you want a chocolate cookie cake frosting recipe, try the one in my chewy s’mores cookie cake.
• Peanut Butter: Use the frosting recipe in peanut butter cookie cake.

Reader Success!

This cookie cake frosting was originally published with my classic cookie cake recipe. Here's what readers have to say about it:

This is THE BEST COOKIE CAKE EVER!! I make it all the time for friends and family and they all love it and say it’s way better than store bought. Everyone always ask to buy one from me because they’re so good! - Emily

I have made this cookie cake a dozen times already, my family prefers it to the store-bought cookie cakes!!! Thanks so much - Lyndell

I am a bit of a cookie cake snob. This is absolutely fabulous – chewy, buttery, with flecks of chocolate throughout. The icing is light, fluffy and adds a bit of delight towards the end of your slice of cookie cake. I highly recommend this recipe! - Megan