Cotton Candy Cake with Cotton Candy Italian Buttercream
This Cotton Candy Cake features soft, pastel-swirled vanilla-cotton candy cake layers paired with a silky Italian buttercream infused with sweet cotton candy flavor. The cake is finished with a generous sprinkle of cotton candy sanding sugar for extra sparkle and sweetness. Light, whimsical, and beautifully nostalgic, this cake delivers classic carnival cotton candy flavor in an elegant, bakery-style dessert perfect for birthdays, parties, and celebration moments.
Servings 12 servings
Calories 750kcal
Cost $14 per cake
Equipment
- Mixing bowls
- Electric mixer or stand mixer
- Whisk
- Rubber spatula
- Measuring cups and spoons
- Kitchen scale (optional but recommended for accuracy)
- 2× 8-inch cake pans or 3× 6-inch cake pans
- Parchment paper
- Cooling racks
- Saucepan (for Italian buttercream syrup)
- Candy thermometer or digital thermometer
- Offset spatula
- Bench scraper or cake smoother
- Cake turntable (optional but helpful)
- Serrated knife (for leveling cakes)
- Piping bags and tips (optional for decorating)
Ingredients
Cotton Candy Cake Layers (3× 6-inch or 2× 8-inch)
- 2 ½ cups all-purpose flour
- 1 ½ cups granulated sugar
- 1 tbsp baking powder
- ½ tsp salt
- 1 cup whole milk room temp
- ½ cup unsalted butter melted
- ½ cup vegetable oil
- 4 egg whites room temp
- 1 tbsp cotton candy extract
- 1 tsp vanilla extract
- Pink and blue gel food coloring optional but pretty!
🍥 Cotton Candy Italian Buttercream
- 1 ½ cups (300g) granulated sugar
- ½ cup water
- 5 large egg whites
- ¼ tsp cream of tartar
- 2 cups unsalted butter room temp and cubed
- 1–2 tsp cotton candy extract to taste
- A drop of pink or blue food coloring optional
🍭 Decoration
- Cotton candy sanding sugar
- Optional: small tufts of real cotton candy added right before serving to prevent melting
- Pastel sprinkles
Instructions
Make the Cotton Candy Cake
- Preheat oven to 350°F (175°C). Grease and line cake pans.
- In a bowl, whisk together flour, sugar, baking powder, salt.
- In a separate bowl, mix milk, melted butter, oil, egg whites, cotton candy extract, and vanilla.
- Add wet ingredients to dry and mix until smooth — avoid overmixing.
- Divide batter into bowls and tint pink and blue for a cotton-candy swirl.
- Pour into pans, gently swirling colors with a knife for a marbled look.
- Bake 22–26 minutes, or until centers spring back.
Cool completely on racks.
- Make the Cotton Candy Italian Buttercream
- In a saucepan, heat sugar + water over medium without stirring until it reaches 240°F (soft-ball stage).
- While it cooks, beat egg whites + cream of tartar on high to soft peaks.
- With mixer running on medium, slowly drizzle hot syrup into the egg whites.
- Increase to high and beat until bowl is cool to the touch (about 8–10 minutes).
- Add butter a few tablespoons at a time until smooth and silky.
- Beat in cotton candy extract and optional food coloring.
- If buttercream curdles, keep whipping — it will come back together.
Assemble the Cake
- Level your cooled cakes.
- Spread a layer of cotton candy Italian buttercream between each cake layer.
- Crumb coat and chill for 20 minutes.
- Frost the cake fully, smoothing the sides.
- Sprinkle generously with cotton candy sanding sugar for sparkle and crunch.
- Optional: Tint some frosting pastel pink/blue and pipe swirls around the top.
- Add tufts of cotton candy right before serving (it melts quickly in humidity!).
Notes
✨ Flavor Notes + Tips
- Cotton candy extract is sweet, nostalgic, and slightly fruity — perfect for kids’ parties.
- Italian buttercream makes the cake taste elegant instead of overly sugary.
- Cotton candy sanding sugar adds extra sparkle + flavor without melting.
- For a stronger cotton candy flavor, add ½ tsp more extract to both cake and buttercream.
- Don’t skip the crumb coat: This helps lock in colorful crumbs from the marbled cake layers and gives you a cleaner final frosting finish.
- Use gel food coloring: Liquid food coloring can thin your batter and dull the colors. Gel yields vibrant cotton-candy pinks and blues without altering texture.
- Control the flavor strength: Cotton candy extract can vary by brand. Start with the lower amount, then taste and add more if you want a stronger, carnival-style sweetness.
- Italian buttercream tips: If the buttercream looks curdled, keep mixing — it almost always comes back together. If it’s too soft, chill it for 10 minutes, then whip again.
- Level your cakes: Swirled cakes rise unevenly at times. Leveling the tops creates a cleaner stack and prevents leaning.
- Chill before slicing: A short chill in the fridge makes frosting firm up and helps you get cleaner, sharper slices.
- Decorate cotton candy last: Real cotton candy melts in minutes from humidity and buttercream moisture. Add it right before serving.
- Use sanding sugar generously: Cotton candy sanding sugar adds sparkle, color, and a burst of extra cotton candy flavor without melting.
- Make ahead: Cake layers can be wrapped and frozen for up to 2 months. Buttercream keeps refrigerated for a week or frozen for 2–3 months.
- Extra pastel effect: For a dreamy look, tint the buttercream two different pastel shades and smear them on the cake for a blended “cotton candy cloud” finish.
- Cotton candy sanding sugar can be found online, such as here.