Preheat your oven to 160°C (320°F).
In a mixing bowl, soften the cream cheese and butter together until smooth.
Add the milk to the mixture and mix well.
In another bowl, whisk the egg yolks and sugar until pale and fluffy.
Combine the egg yolk mixture with the cheese mixture, stirring gently.
Sift in the flour and cornstarch, mixing until just combined.
In a clean bowl, whip the egg whites with a pinch of salt until soft peaks form.
Gently fold the whipped egg whites into the cheese mixture in three parts.
Pour the batter into a lined springform pan.
Bake in a water bath for 60 minutes or until the top is golden brown.