A magical three-layered dessert with a flan-like base, creamy custard middle, and fluffy egg white top.
Preheat your oven to 325°F (160°C).
Melt the butter in a saucepan until browned, then let it cool.
In a mixing bowl, beat the egg yolks with the brown sugar until thick and ribbony.
Add the cooled browned butter, milk, and vanilla extract to the egg yolk mixture and mix well.
Sift in the flour and mix until just combined.
In a separate bowl, beat the egg whites until stiff peaks form.
Gently fold the beaten egg whites into the batter, leaving some chunks of egg white floating.
Pour the batter into a prepared cake pan and bake for 45-50 minutes.
Let the cake cool completely before serving.