Preheat the oven to 350 degrees Fahrenheit.
Separate the egg yolks from the whites into two different large mixing bowls.
In a large bowl, whip the whites for a minute or two, until soft peaks form. Then add 1/3 cup of sugar and continue mixing at high speed until it has stiff peaks.
In a separate bowl, whip the yolks and 2/3 cup of sugar until it looks pale yellow. Add vanilla extract, whole milk, and rum (if using)then mix for another minute.
Sift flour, baking powder, and salt into the egg yolk mixture and fold the dry ingredients with a spatula until well blended. Do not overmix(mix too long) but ensure there are no lumps.
Carefully add egg yolk mixture to the whites and fold them (instead of mixing) to preserve the fluff you already achieved. That will create a perfectly sponge-y texture in your cake!
Prepare a 9x13 baking pan by greasing it lightly.
Pour cake batter into prepared baking dish and place it in the preheated oven.
Bake for 25-30 minutes. Test doneness with a toothpick or skewer.
Once the sponge cake is done, allow it to cool for about an hour on a wire rack.
When the cake is almost cooled, make the milk mixture to soak your cake in. Mix evaporated milk, coconut milk, condensed milk, ground cinnamon, and rum (if using). Set aside.
Poke holes on the cake with a fork or toothpicks and pour mixture over cooled cake.
Cover with plastic wrap or a lid, and refrigerate for about 4-6 hours (or overnight) so the cake absorbs the moisture and flavor.
When you are almost ready to serve, make the whipped topping. With a mixer, blend the heavy cream, coconut cream and cinnamon until peaks form. If you are using store-bought topping, you can simply add cinnamon or use as-is.
Toast the coconut flakes in a skillet over medium heat for a couple of minutes. Flip them constantly so they do not burn. Once they turn golden brown, remove them from the heat. Otherwise, you can slice the fruit you chose to top your cake with.
Spread the whipped topping across the top of the cake, then sprinkle coconut flakes or place fruit on top of it.
Cut in squares and serve.
¡Buen provecho from The Happy Wookiee!