Preheat oven to 180 degree centigrade.
Grease a spring form pan.
Chop 10 Oreo's into quarters and roughly line the bottom of the spring form pan with the Oreo pieces.
Separate the yolk form the whites of the egg.
Scrap the seeds from the vanilla pod and add to a large bowel along with the quark, cottage cheese, sugar, egg yolks, vanilla extract, little zest from a lemon and the cornstarch.
Whisk until all ingredients are well combined.
In another bowl whisk the egg whites until they form soft peaks.
Fold this into the rest of the mixture.
Pour this on the top of Oreo pieces in the springform pan and gently tap the sides, so the mixture is evenly distributed in the pan.
Place in the oven and bake for approximately 35 mins.
When cooked the cheesecake will be slightly golden around the edges. You can gently place a skewer in the centre just to make sure the middle is not too wet still.
Leave the cheesecake to cool in the oven with the door slightly ajar.
Once cooled you can then place in the fridge to chill before slicing.
Once ready to serve. Get the remaining Oreo cookie.