Separate 5 beautiful eggs. Place the egg yolks in a bowl, and the egg whites in a mixer bowl.
Place the butter, cream cheese and ¼ cup of fine sugar into a pot over low-heat. Allow the ingredients to melt, and mix together into a beautifully smooth batter mixture.
Remove the pot from heat, and add the egg yolks into the batter mixture. Mix well, but gently.
Add the cornstarch and flour. Once again, mix well. Clumps should disappear.
Add milk and optionally vanilla extract or other flavors of your choice.
Mix well. The batter should be smooth and liquid-y. You won’t have to strain this mixture.
Set aside the batter as you beat the egg whites into stiff peaks.
Pre-heat oven to 330F. Prepare a bain-marie by putting water in a deep rectangular baking pan or dish. Place into the oven.
Prepare baking pans— with these ingredients, you can bake one 8-inch cake or two 6-inch cakes. Line the bottoms of the baking pans with circular parchment paper, and the inside sides with rectangular strips of parchment paper.
Once you achieve stiff peaks, place some beaten egg white into the batter and mix together.
Repeat the above step two more times.
Pour the batter into the rest of the egg whites and mix together using folding techniques. Don’t over-mix or under-mix.
Pour the well-incorporated batter into the baking pan(s).
Bake bain-marie style for 25 minutes at 330F. Adjust the temperature if necessary.
After 25 minutes, if the cake has not risen yet, keep it at the same temperature and give it time, or raise the temperature. Once it rises, crack open the oven door for 10 seconds, then lower the temperature to 245-265F and bake for an additional 45 minutes.
Allow your cake to rest in the oven after baking for about 10 minutes.
Remove from the oven. Be careful and use oven mitts as needed.
Place a sheet of parchment paper over the cake. Place a plate over the cake and flip it upside down.
Remove the wet parchment paper from the cake, replace the bottom parchment paper.
Place another plate on top of the cake and flip the cake again carefully.
Serve when still warm, or chill in the fridge. It won’t be bouncy or fluffy after chilling though!