This copycat Crumbl Birthday Cake Cookie is soft, chewy, and topped with sweet frosting that melts in your mouth. The best part is how festive and fun it looks with all the colorful sprinkles, making it perfect for birthdays and celebrations. It’s a bakery-style cookie you can make in your own kitchen without waiting in line.

At home, I love making these when we want something extra special. I use plenty of rainbow sprinkles in the dough because they make every bite cheerful and bright. Always, I swirl on a thick layer of frosting because that’s what gives it that true Crumbl finish.

I love enjoying these cookies with a glass of cold milk, some fresh fruit on the side, or even with a scoop of ice cream for a party treat. If you have kids like mine, they’ll be thrilled to help decorate the cookies with extra sprinkles—it turns baking into a fun family activity.

What is Crumbl Birthday Cake Cookie?

The Crumbl Birthday Cake Cookie is a soft, bakery-style cookie made with a buttery vanilla dough mixed with rainbow sprinkles, then topped with a thick swirl of sweet buttercream frosting and even more sprinkles. It’s inspired by the fun flavors of classic birthday cake—sweet, colorful, and festive.

Crumbl is famous for making oversized gourmet cookies, and their birthday cake version is one of the most popular because it tastes just like a slice of frosted cake in cookie form.

Ingredients

For the Cookies:

• 1 cup unsalted butter, softened
• 1 cup white sugar
• ½ cup brown sugar
• 2 large eggs
• 2 teaspoons vanilla extract
• 2 ¾ cups all-purpose flour
• 1 teaspoon baking powder
• ½ teaspoon baking soda
• ½ teaspoon salt
• ½ cup rainbow sprinkles

For the Frosting:

• ½ cup unsalted butter, softened
• 2 cups powdered sugar
• 1 teaspoon vanilla extract
• 2–3 tablespoons heavy cream or milk
• Extra rainbow sprinkles, for topping

Equipment Must-Have

• Large mixing bowl
• Hand or stand mixer
• Measuring cups and spoons
• Rubber spatula or wooden spoon
• Baking sheet
• Parchment paper
• Cooling rack
• Piping bag with a large round tip

How to make Crumbl Birthday Cake Cookie

Step 1

Make the dough: In a large bowl, beat together the softened butter, white sugar, and brown sugar until fluffy. Add the eggs and vanilla extract and mix until smooth. In another bowl, whisk together the flour, baking powder, baking soda, and salt. Slowly add the dry mixture to the wet ingredients, stirring until the mixture is just combined. Fold in the sprinkles.

Step 2

Bake the cookies: Preheat the oven to 350°F (175°C). Line a baking sheet with parchment paper. Scoop the dough into large balls (about 3 tablespoons each), place them spaced apart, and flatten slightly. Bake for 12–14 minutes, until the edges are set but the centers look soft. Let cool fully on a wire rack.

Step 3

Make the frosting: In a bowl, beat the softened butter until creamy. Add powdered sugar, vanilla, and milk one spoon at a time until smooth and fluffy. Transfer to a piping bag with a round tip.

Step 4

Decorate: Pipe a thick swirl of frosting onto each cooled cookie. Finish with extra sprinkles on top. Serve fresh and enjoy!

Tips for the Best Crumbl Birthday Cake Cookies

• Freeze for birthdays anytime – Keep a batch of baked, unfrosted cookies in the freezer. When a celebration comes up, just thaw, frost, and add sprinkles.
• Chill for chunkier cookies – If you like your cookies extra thick, chill the dough for 20 minutes before baking. It helps them puff up instead of spreading flat.
• Make them sparkle – Roll the cookie dough balls in extra sprinkles before baking. They’ll look colorful even before the frosting goes on.
• Double swirl magic – Use two colors of frosting in the piping bag (like pink and white). When you pipe, you’ll get a pretty two-tone swirl.
• Mini but mighty – Scoop smaller cookies for party platters or kid-sized treats. They bake faster, and you can call them “birthday bites.”

Serving Ideas

I love serving these Crumbl Birthday Cake Cookies on a platter as the centerpiece of a birthday party. Instead of bringing out a traditional cake, stack the cookies high on a cake stand and add a few candles on top. It looks just as festive, and kids love the idea of having their own “mini birthday cakes.”

These cookies also make the cutest party favors. I like to wrap each one in clear cellophane bags and tie them with bright ribbon. Guests can take them home, and they look so cheerful that they double as party decorations.

Another fun idea is to turn them into ice cream sundaes. Break the cookies into chunks and sprinkle them over a scoop of vanilla or birthday cake–flavored ice cream. Add extra sprinkles and maybe a drizzle of chocolate sauce, and you’ve got the ultimate celebration dessert.

How to store

Storing these Crumbl Birthday Cake Cookies is easy. Keep them in an airtight container at room temperature for 2 days or in the fridge for up to 5 days. Let chilled cookies sit out a few minutes before serving so they stay soft and chewy.

For longer storage, freeze unfrosted cookies in a freezer bag with parchment between layers for up to 3 months. Thaw at room temperature, then frost and decorate before serving.

FAQ

Do I need to chill the dough?
Not always, but chilling for 20–30 minutes helps the cookies stay thick and chewy. If you like chunkier bakery-style cookies, chilling is a good idea.

Can I use different sprinkles?
Of course! Rainbow sprinkles are classic, but you can use holiday colors, pastel sprinkles for Easter, or red and green for Christmas.

What frosting works best?
Buttercream is the classic choice, but cream cheese frosting adds a tangy balance. Both are delicious and pipe nicely.

Can I make the cookies smaller?
Yes, just scoop 1–2 tablespoons of dough per cookie and bake for a couple of minutes less. They’re perfect for parties or bite-sized treats.