Add the egg yolks gradually, beating continuously until fully incorporated.
Add the sugar gradually while beating until the mixture becomes light and airy.
Fold in the cornstarch gradually using a whisk, mixing gently to keep the batter airy.
Transfer the batter to a greased baking pan (butter and cornstarch).
Bake in a preheated oven at 180°C (350°F) for 35 to 40 minutes.
Remove, unmold, and serve.
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Notas
Whip the egg whites well to stiff peaks to ensure a light texture. Mix gently to avoid deflating the batter. You can add vanilla extract or lemon zest for extra flavor.