Preheat your oven to 180 ° C or 350 ° F,

In a glass bowl over boiling water whisk together the cheese, oil, 1/4 cup sugar, and milk until smooth.

Remove from heat and set aside to reach room temperature.

Separate the eggs. The egg whites into the mixer bowl and the yolks into another bowl.

Begin whipping the egg whites with a pinch of salt until foamy then slowly add a half cup of sugar. Continue whisking until firm and foamy.

Add the zest to the cheese mixture that has cooled and mix.

In three additions and gently combine the egg whites and the cheese mixture.

Now Sift the potato starch and vanilla pudding into the batter in three additions and gently fold until combined.

Grease and line with parchment the bottom and sides of an 8 inch round baking pan. ( watch video)

It is also recommended to wrap the outside of the pan with foil too.

Put the baking pan into a larger pan and fill it almost to the top with warm water.

Place the cake in the oven for 15 minutes. After 15 minutes lower the oven heat to 300 degrees Fahrenheit and 150 degrees Celsius for another hour. Turn off the oven and leave the cake in the oven for 15 more minutes.

You can sprinkle the cake with powdered sugar or decorate with whipped cream.