BT21 Cake Recipe (Full of Color & Joy)

If your kids (or you, no judgment here 💜) are obsessed with the adorable BT21 characters, this BT21 Cake is the ultimate party centerpiece! Inspired by the lovable characters created by BTS and LINE FRIENDS—Tata, Chimmy, Koya, RJ, Cooky, Mang, Shooky, and Van—this cake brings bright colors, playful decorations, and lots of joy to the dessert table.

Whether you go full fondant or stick to colorful buttercream and toy toppers, this cake is meant to spark smiles and squeals of excitement. Perfect for birthdays, BTS fan parties, or just because, it’s easier to make than it looks—with plenty of shortcuts for busy parents or first-time bakers!

What You’ll Need

For the Cake:

• 2 ½ cups all-purpose flour
• 2 ½ teaspoons baking powder
• ½ teaspoon salt
• 1 cup unsalted butter, softened
• 1 ¾ cups granulated sugar
• 4 large eggs
• 1 tablespoon vanilla extract
• 1 cup whole milk
• Gel food coloring (pink, blue, yellow, purple, etc.)

For the Buttercream Frosting:

• 1 cup unsalted butter, softened
• 3 ½ cups powdered sugar
• 1 teaspoon vanilla extract
• 2–3 tablespoons milk
• Gel food coloring for decorating (same as above)

For Decorations:

• BT21 figurines or edible toppers
• Star or heart sprinkles
• Optional: fondant to shape characters or decor
• Piping bags and star tips

Pro Tips for a Show-Stopping BT21 Cake

🎨 Use Gel Colors – They make the colors pop without thinning the batter or frosting.
🧁 Divide Batter Evenly – Use a kitchen scale or measuring cup to ensure even layers.
🎂 Chill Before Decorating – A cold cake is easier to frost and keeps the layers clean.
👧 Let the Kids Help Decorate – They’ll love placing characters and adding sprinkles!
✨ Use Store-Bought Toppers – Not into fondant? BT21 figurines from Amazon work perfectly!

Tools You’ll Need

• Mixing bowls
• Hand or stand mixer
• Measuring cups and spoons
• 3 6-inch or 8-inch cake pans
• Parchment paper
• Offset spatula
• Piping bags and tips
• Cake stand or turntable

Substitutions & Variations

🌈 Boxed Cake Mix – No shame in it! Use a white or vanilla box mix and color it.
🧁 Cupcakes Instead – Make BT21 cupcakes for an easy party treat.
🍓 Flavor Variations – Add strawberry, lemon, or chocolate flavor to each colored layer!
🧈 Dairy-Free? Use dairy-free butter and milk alternatives.

Make-Ahead Tips

• Bake cake layers up to 2 days ahead and wrap tightly in plastic
• Buttercream can be made ahead and stored in the fridge for 3 days—just rewhip before using
• Fully decorated cakes can be refrigerated overnight, just let sit at room temp for 1 hour before serving

How to Make a BT21 Cake

Step 1: Make the Cake Batter

1. Preheat oven to 350°F (175°C). Grease and line 3 cake pans with parchment.
2. In a bowl, whisk together flour, baking powder, and salt.
3. In another bowl, beat butter and sugar until fluffy.
4. Add eggs one at a time, then vanilla.
5. Alternate adding flour mixture and milk to the butter mixture.
6. Divide batter into 3 or 4 bowls and tint each with a different gel color.
7. Pour into pans and bake 25–30 minutes, or until a toothpick comes out clean.

Step 2: Make the Buttercream

1. Beat butter until creamy.
2. Gradually add powdered sugar, then vanilla and milk.
3. Divide frosting and tint with matching gel colors for decorating.

Step 3: Assemble the Cake

1. Level cooled cake layers. Stack with a thin layer of white buttercream in between.
2. Apply a crumb coat (thin layer of frosting), then chill for 30 minutes.
3. Frost the outside with smooth buttercream in your color of choice.

Step 4: Decorate

1. Pipe stars, swirls, or waves around the edges with colored buttercream.
2. Place BT21 character toppers on top or around the base.
3. Add sprinkles, fondant stars, or other decor to complete the look.

Step 5: Chill and Serve

1. Chill finished cake for 1 hour to set decorations.
2. Slice and watch the kids go wild! 🎉

Leftovers & Storage

• Store covered in the fridge for up to 4 days
• Let slices come to room temp before serving
• Freeze leftover slices wrapped tightly for up to 2 months

Final Thoughts

This BT21 cake isn’t just a dessert—it’s a party in cake form! Whether you’re baking for a little BTS fan or creating something kawaii just because, this cake is bound to bring joy, color, and creativity to the table. And don’t worry if it’s not perfect—it’s all about the fun and celebration.

💬 Drop a comment below if you made this cake! Which character was your favorite to decorate with? I’d love to see your creations. Happy baking, ARMYs and artists! 💜🍰🎨