Step 1

Step 1: Prepare the oven. Preheat it to 325 degrees F.

Step 2

Step 2: Ready an 8 x 8-inch baking dish. Lightly grease and set aside.

Step 3

Step 3: Beat the egg whites until stiff peaks form. Set aside.

Step 4

Step 4: Mix the egg yolks with powdered sugar until the mixture becomes pale yellow. Stir in the melted butter and about 1 tbsp water until completely blended. This takes about 2 minutes. Add the flour and beat until evenly blended. Gradually whisk in the milk and vanilla extra until well mixed. Lastly, fold in the egg whites, 1/3 at a time.

Step 5

Step 5: Into the prepared baking pan, pour the batter. Place in the preheated oven and bake for about 40 to 60 minutes or until the center of the cake is barely jiggly. Tent the cake with aluminum foil if the top browns too quickly.

Step 6

Note: The baking time varies depending on the oven, so I suggest checking after 40 minutes of baking.

Step 7

Step 6: Remove from the oven when done, and let the cake cool fully before dusting it with powdered sugar.