1- Before making your batter do please preheat your oven to 350 degrees as a first step.
2- Mix and stir egg yolks, vanilla, milk and melted butter in a medium-size bowl.
3- Add to the mixture you already made your cornmeal, flour, baking powder, sugar, salt then stir the ingredients until they are completely blended and combined. Be sure not to over-mix the batter because over-mixing the batter will result in a dense texture.
4- Now, take another bowl in which you can beat the egg whites you have, stop beating when it forms peaks. Then fold the beaten egg whites into the batter.
5- In a greased 9X13 inch pan pour your batter and bake it for about 25 to 30 minutes. You can also do a toothpick test by inserting it in the cake and if it comes out clean then your cake is done you can enjoy it!