Prepare the Cake

1. Preheat Oven: Begin by preheating your oven to 350°F (175°C). Line a 10×15-inch baking sheet with parchment paper and lightly grease the paper.
2. Mix Dry Ingredients: In a small bowl, whisk together the flour, baking powder, and salt. Set aside.
3. Beat the Eggs and Sugar: In a large mixing bowl, beat the eggs and 1/2 cup sugar together until thick, pale, and fluffy. This will take about 5-7 minutes on medium speed with an electric mixer.
4. Add Wet Ingredients: Mix in the vanilla extract, milk, and oil until just combined.
5. Fold in the Dry Ingredients: Gently fold the flour mixture into the wet ingredients, being careful not to deflate the batter.
6. Add Food Coloring: If you’re using food coloring, add a few drops of pink food coloring to give your cake that cotton candy pink hue. Fold the color in until you get the desired shade.
7. Bake: Pour the batter into your prepared baking sheet and spread it evenly. Bake for 12-15 minutes or until the cake springs back when lightly touched.
8. Cool the Cake: Once baked, remove the cake from the oven. Let it cool in the pan for about 5 minutes, then turn the cake onto a clean kitchen towel dusted with powdered sugar. Peel off the parchment paper and roll the cake up with the towel, starting from one short edge. Let the cake cool completely, wrapped in the towel.

Make the Cotton Candy Frosting

1. Beat the Butter: In a medium bowl, beat the softened butter until smooth and creamy.
2. Add Powdered Sugar: Gradually add the powdered sugar, 1/2 cup at a time, beating until smooth.
3. Add the Flavoring: Mix in the vanilla extract and cotton candy flavoring or extract.
4. Adjust Consistency: Add milk one tablespoon at a time until you reach a smooth, spreadable frosting consistency.
5. Color the Frosting: Divide the frosting into two bowls. Add a few drops of pink food coloring to one bowl and blue food coloring to the other. Mix until the colors are vibrant and well incorporated.

Assemble the Cake Roll

1. Unroll the Cake: Carefully unroll the cooled cake, being gentle not to tear it.
2. Frost the Cake: Spread a generous layer of cotton candy frosting over the entire surface of the cake.
3. Roll It Back Up: Gently roll the cake back up, this time without the towel. Be sure to roll it tightly, but don’t force it.
4. Chill: Place the rolled cake on a serving platter and refrigerate for at least 30 minutes to set.