Equipment:

• 10×15-inch jelly roll pan (or a similar size)
• Electric mixer or stand mixer
• Parchment paper
• Cooling rack
• Whisk
• Rubber spatula
• Measuring cups and spoons
• Serrated knife (for trimming edges)
• Serving platter

Instructions:

1. Prepare the Sponge Cake:

• Preheat your oven to 350°F (175°C). Line a 10×15-inch jelly roll pan with parchment paper, ensuring it covers the bottom and sides of the pan. This makes it easier to remove the cake later.
• In a medium bowl, sift together the flour, cornstarch, baking powder, and salt. This ensures an even distribution of dry ingredients and prevents lumps.