01 -
Preheat your oven to 375℉. Spray a 9x13-inch baking pan with cooking spray. Set aside.
02 -
Separate the eggs, placing the egg whites in a bowl for later. In another bowl, add the egg yolks, 2/3 cup sugar, and vanilla extract. Beat with a mixer on high speed until thick and pale, about 2 minutes.
03 -
In another bowl, whisk together the flour, baking powder, and salt. Add half the dry mixture to the egg yolk mixture and whisk until combined. Add the milk, then the remaining dry mixture, and whisk well. The batter should be thick.
04 -
In a clean bowl, beat egg whites on high speed until stiff peaks form. Gradually add 3 tablespoons sugar and beat for another minute until sugar is dissolved. Fold the whipped egg whites gently into the cake batter.
05 -
Pour the batter into the prepared pan. Bake for 20 minutes or until a toothpick inserted into the center comes out clean. Allow the cake to cool for 10 minutes.
06 -
While the cake is cooling, whisk together the sweetened condensed milk, evaporated milk, regular milk, and rum in a bowl.
07 -
Pierce the cooled cake all over with a fork. Gradually pour the milk mixture evenly over the cake. Cover the pan with plastic wrap and refrigerate for at least 3 hours or overnight.
08 -
Top the cake with whipped cream, cocoa powder, and mixed berries, if desired. Serve chilled.