01 -
Preheat oven to 160°C. Grease an 20×20 cm baking dish or line with parchment paper to facilitate easy removal.
02 -
Carefully separate egg yolks and egg whites, placing them into two large mixing bowls.
03 -
Using an electric mixer, beat the egg yolks with granulated sugar until mixture becomes pale and slightly thickened.
04 -
Pour melted butter, water, and vanilla extract into the yolk mixture and mix until homogeneous.
05 -
Gradually sift in the flour, mixing on low speed until no lumps remain.
06 -
Slowly add lukewarm milk while mixing continuously, resulting in a thin batter.
07 -
With clean beaters, whip the egg whites in a separate bowl until stiff peaks form.
08 -
Gently fold whipped egg whites into the thin batter, taking care not to deflate them completely. The mixture will remain liquid.
09 -
Pour the batter into the prepared dish and bake for 50–60 minutes, or until the top is golden brown and set with a slight jiggle in the center.
10 -
Allow cake to cool completely in the pan. Dust with powdered sugar just before slicing and serving. Layers will become more distinct once cooled.