Preheat the oven to 160°C.
Grease your baking pan and line it with a suitably cut circle of baking paper on the bottom and squares of baking paper against the sides. This way, it is lined all around and comes out easily.
Put cream cheese, milk, and butter in your mixing bowl and set your device to gently warm or chocolate melting option.
Stir everything well until smooth and pour into a large bowl.
Mix flour, salt, and cornstarch together and whisk them in firmly until you have a smooth dough with no lumps visible.
Beat the yolks with half of the sugar and lemon juice for 5 minutes until fluffy.
Mix into the cream cheese, also beat the egg whites with the other half of the sugar. Definitely degrease that mold first with a drop of vinegar.
Then carefully fold in the whipped egg whites in 2 batches. There should be no clouds left in it.
Pour the mixture into your baking pan. This will be cooked au bain-marie, so place it in a roasting pan or larger dish with 1-2 cm of water in it.
Bake for about an hour and a quarter.
Turn off the oven and let it sit for another 15 minutes in the oven with the door open.
Remove from the oven, place a plate on top, let it sit for 5 minutes, and turn it over.
Dust with powdered sugar