Prepare the Cake

1. Preheat Oven: Preheat your oven to 350°F (175°C). Line a 10×15-inch jelly roll pan with parchment paper and lightly grease it.
2. Mix Dry Ingredients: In a medium bowl, whisk together the flour, baking powder, and salt. Set aside.
3. Separate Eggs: Separate the egg yolks and whites into two large bowls. Beat the egg whites until soft peaks form.
4. Prepare the Batter: In another bowl, beat the egg yolks with 1/2 cup of sugar until pale and fluffy. Add the milk, melted butter, and vanilla extract, and beat until combined. Gradually fold in the dry ingredients until smooth.
5. Add Cotton Candy Flavor: Add the cotton candy flavoring to the batter, mixing it in until evenly distributed.
6. Fold in Egg Whites: Gently fold the egg whites into the batter in three parts, taking care not to deflate the mixture.
7. Color the Batter: Divide the batter into two portions. Add a few drops of pink food coloring to one and blue to the other, mixing gently.
8. Pour and Swirl: Pour the pink batter into the pan, followed by the blue batter. Use a knife or toothpick to swirl the colors together to create a marbled effect.
9. Bake: Bake the cake for 15-20 minutes, or until a toothpick inserted into the center comes out clean.
10. Cool the Cake: Once the cake is done, remove it from the oven and let it cool for 10 minutes before transferring it to a clean kitchen towel or parchment paper. Roll the cake while it’s still warm to prevent cracking and set it aside to cool completely.

Prepare the Filling

1. Whip the Cream: In a chilled mixing bowl, whip the heavy cream with powdered sugar and vanilla extract until soft peaks form.
2. Add Flavoring: Gently fold in the cotton candy flavoring, ensuring it’s evenly distributed throughout the whipped cream.
3. Set Aside: Once the cream is ready, set it aside until you’re ready to assemble the cake.

Assemble the Cake

1. Unroll the Cake: Carefully unroll the cooled cake. Spread the cotton candy whipped cream evenly across the cake, leaving a small border around the edges.
2. Roll the Cake: Gently roll the cake back up, starting from one edge. Be sure to do this slowly and carefully to avoid any cracks.
3. Chill: Place the rolled cake in the refrigerator for at least 30 minutes to allow it to set and hold its shape.

Serve the Cake

1. Slice and Serve: Once chilled, slice the cake into thick rounds and serve on a platter. Enjoy the beautiful swirl and delicious flavor with every bite!