A magical triple-layer cake with a sponge top, creamy custard center, and dense base, all made from one simple batter.
4 large eggs, room temperature, separated
3/4 cup granulated sugar
1/2 cup unsalted butter, melted and cooled
1 tsp pure vanilla extract
3/4 cup all-purpose flour, sifted
2 cups whole milk, lukewarm
Powdered sugar for dusting
1. Preheat oven to 325°F (160°C) and grease an 8×8 inch pan.
2. Whip egg whites to stiff peaks and set aside.
3. Beat egg yolks and sugar until pale and creamy.
4. Mix in melted butter and vanilla extract.
5. Add sifted flour and mix until combined.
6. Slowly whisk in lukewarm milk until smooth.
7. Gently fold in egg whites in three batches.
8. Pour into pan and bake for 45–60 minutes.
9. Cool completely, then refrigerate for at least 3 hours before slicing.
Ensure eggs are room temperature for better volume.
The milk must be lukewarm to prevent butter clumping.
The cake must be served chilled to maintain the custard layer.