Step 1

Preheat the oven to 350F(180C).

Step 2

Separate the eggs.

Step 3

In a stand-up mixer, cream together the yolks with the powder sugar.

Step 4

Add the melted butter slowly and keep mixing. When the butter is incorporated, add the milk.

Step 5

Keep mixing while you add the flour spoon by spoon and the vanilla. Set aside.

Step 6

Separately, beat the egg whites with a pinch of salt until stiff. Pour the egg whites over the batter and fold them slowly to incorporate the egg whites into the mixture. The batter will be thin, but this is normal.

Step 7

Lightly butter and flour in a 9x13 baking dish.

Step 8

Pour the batter into the dish and bake 10 minutes at 350F, then reduce the heat to 325F and bake for another 50 minutes.

Step 9

Let it cool completely, then put it in the refrigerator for few hours. It is better if the cake sits in the refrigerator overnight to set completely.

Step 10

Sprinkle the cake with powder sugar and serve.