Great American Cookie Icing Recipe (Cookie Cake Buttercream)

A cookie cake lives or dies by its icing. The cookie itself can be a perfect chewy chocolate chip round, but what everyone remembers, and what every birthday photo shows, is the thick fluffy buttercream border and the bright piped writing across the middle.

That mall cookie-shop icing is not royal icing, and not a standard all-butter buttercream either. The secret is the partnership of butter and vegetable shortening: butter brings the flavor, shortening brings the structure. The result whips up pale and fluffy, holds piped shells and letters without slumping, and stays soft to bite into instead of crusting over hard.

This recipe makes about 3 cups: enough for one 12-inch cookie cake with a border, decorations, and writing, plus a little extra for fixing mistakes. There are always mistakes worth fixing.

Why You’ll Love This Recipe

It pipes like a dream. The shortening keeps the buttercream stable at room temperature, so shell borders stay crisp-edged and rosettes hold their swirls through a whole party instead of relaxing into puddles.

It tastes like the shop version. A full two teaspoons of vanilla and a pinch of salt keep it from tasting one-note sweet, and the texture is genuinely fluffy rather than greasy or dense.

It takes color beautifully. One white batch divides into bowls and becomes every shade on the cake.

If decorating is your happy place, this buttercream sits comfortably alongside the other finishes we reach for again and again, our spiced cinnamon icing and our glossy pink glaze, which between them cover most cookie and cake situations.

Ingredients

Start with everything at cool room temperature; cold butter will not whip, and warm butter will not hold a piped edge:

• ½ cup (113 g) unsalted butter, softened
• ½ cup (96 g) vegetable shortening
• 4 cups (480 g) powdered sugar, sifted
• 2 teaspoons vanilla extract
• ¼ teaspoon fine salt
• 2–3 tablespoons milk or heavy cream

You will also need: piping bags, a large star tip (Wilton 1M or 21) for borders, and a small round tip (Wilton 3) for writing. Gel food coloring only, for reasons explained below.

How to Make It

1. Beat the base: Beat the butter and shortening in a large bowl or stand mixer on medium-high for 2 to 3 minutes, until pale, smooth, and noticeably fluffy. This step builds the light texture, so do not rush it.
2. Add the sugar in two additions: With the mixer on low, add half the sifted powdered sugar. Mix until it disappears, then add the rest. Starting low keeps the sugar in the bowl instead of in a cloud over the counter. Scrape the bowl once.
3. Flavor and loosen: Add the vanilla, salt, and 2 tablespoons of milk or cream. Beat on medium for 1 minute until smooth and spreadable. If it feels stiff and heavy, beat in the third tablespoon a teaspoon at a time.
4. Set your consistency: For writing, you want it stiff: a firm peak on the spatula. For shells, borders, and rosettes, medium: a peak that just curls at the tip. For flooding a smooth top, thin with milk, ½ teaspoon at a time, until it settles flat in about 10 seconds.
5. Color it: Divide into bowls and tint with gel food coloring, a drop or two at a time. Gel colors are concentrated and add almost no liquid; liquid coloring thins the icing and weakens piped edges, so it has no place here.
6. Pipe the cake: Border first, writing second. Pipe a star or shell border at the edge of the cooled cookie cake, then practice your message once on parchment before committing it to the cake. Letters are easier with the bag at a 45-degree angle, moving your whole arm, not your wrist.

Cooking Tips / Variations

Grainy icing almost always means unsifted sugar or sugar added too fast. Sift it, add it in two additions, and beat the finished buttercream a full minute; if it still feels sandy, rest it 15 minutes and beat again, so the sugar dissolves into the milk.

If the icing goes soft and greasy on a hot day, chill the bowl for 10 minutes and re-whip. In a very warm kitchen, use heavy cream instead of milk and keep the finished cake somewhere cool.

Bubbles are the enemy of smooth writing. After beating, run the mixer on its lowest speed for 1 minute, or press the icing against the bowl with a spatula to push out air pockets.

Easy flavor turns: swap ½ teaspoon of the vanilla for almond extract for a bakery-shop flavor, beat in ¼ cup cocoa powder (plus a splash more milk) for chocolate, or add a teaspoon of lemon zest and a drop of yellow gel color for spring cakes.

Serving or Storage Tips

One batch frosts one 12-inch cookie cake generously: about 1 cup for the border, ½ cup for writing and accents, the rest for extra rosettes. For a 16-inch cake, make a batch and a half.

Store leftovers airtight: 2 days on the counter, 2 weeks in the refrigerator, or 3 months in the freezer. Cold icing will not pipe, so bring it back to room temperature and re-whip a minute until fluffy before using.

A frosted cookie cake keeps, covered, at room temperature for 2 to 3 days. Refrigerating the whole cake dries the cookie out, so the counter is the better home for it once it is decorated.

Conclusion

Butter for flavor, shortening for structure, gel color for those unmistakable bright borders: that is the whole secret of the cookie-shop icing, and it takes about fifteen minutes to make at home.

Whip it once, learn the three consistencies, and every cookie cake from here on, birthday, graduation, or just Tuesday, comes out looking like it came from the mall counter.

Great American Cookie Icing

The fluffy butter-and-shortening buttercream used on mall cookie cakes, firm enough to pipe crisp borders, rosettes and writing, and soft to bite.

Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 0 minutes mins

Total Time 15 minutes mins

Servings: 3 cups

Cuisine: American

Ingredients Method Notes

Ingredients

  

• ½ cup 113 g unsalted butter, softened
• ½ cup 96 g vegetable shortening
• 4 cups 480 g powdered sugar, sifted
• 2 teaspoons vanilla extract
• ¼ teaspoon fine salt
• 2–3 tablespoons milk or heavy cream

Method

 

1. Beat butter and shortening on medium-high for 2–3 minutes until pale and fluffy.
2. On low speed, add the sifted powdered sugar in two additions, scraping the bowl once.
3. Add vanilla, salt and 2 tablespoons milk or cream; beat 1 minute, adding the third tablespoon only if needed.
4. Adjust consistency: stiff for writing, medium for borders and shells, thinned with milk for flooding.
5. Tint portions with gel food coloring only; liquid coloring thins the icing.
6. Pipe the border first, then the writing, practicing the message once on parchment.

Notes

Gel food coloring only — liquid coloring weakens piped edges.
Store airtight: 2 days on the counter, 2 weeks in the fridge, 3 months in the freezer; re-whip after chilling.
If the icing turns soft in a warm kitchen, chill the bowl 10 minutes and re-whip.
One batch covers a 12-inch cookie cake; make 1½ batches for a 16-inch cake.