Preheat your oven to 325 degrees F. Spray three 8-inch round cake pans with nonstick spray, line the bottom with parchment paper and spray again. Set aside.
In the bowl of a stand mixer fitted with the paddle attachment, beat the butter and the sugar together on medium-high speed for two minutes.
Gradually add the egg whites and whole eggs, making sure to scrape down the sides and the bottom of the bowl between additions. Mix on medium-high for 2 minutes after all the eggs are added. The mixture should be smooth and fluffy.
Add the coconut emulsion and vanilla extract.
In a medium size mixing bowl, whisk the cake flour, baking powder, and salt.
Turn the mixer on low speed and alternately add the flour mixture and the coconut milk, starting and ending with the flour mixture. Mix until combined.
Evenly distribute the batter in your pans.
Bake for about 23-25 minutes, or until the tops are slightly golden brown and the edges of the cake start to pull away from the sides of the pan.
Let cool in pans for 10 minutes and then invert onto cooling racks to cool completely.