Instructions:
1. Make the Sponge Cake Layers:
• Preheat your oven to 350°F (175°C). Grease and line an 8-inch round cake pan with parchment paper.
• In a large bowl, whisk egg yolks with half of the sugar until pale and thick.
• In another bowl, whisk egg whites until foamy, gradually adding the remaining sugar until stiff peaks form.
• Gently fold the egg whites into the yolk mixture. Then, fold in the sifted flour and melted butter until just combined.
• Pour a thin layer of batter (about 1/8 inch) into the prepared pan and bake for 5