Finely crumble the oreo biscuits in a freezer bag. Melt the butter and knead together with the biscuit crumbs in a bowl. Press the mass onto the bottom of a springform pan (24 cm diameter) with a spoon.
Mix the quark, double cream cheese, vanilla sugar, sugar and flour with a hand mixer on a medium setting until creamy. Add the eggs one after the other and stir in well. Pour the mixture into the springform pan and smooth it out.
Tip: Cover the surface with additional scraped-off biscuit halves as desired.
Bake in the preheated oven at 160 ° C top / bottom heat (convection: 150 ° C) on the 2nd rack from the bottom for approx. 40 to 50 minutes.
Let cool for one hour at room temperature. Then chill in the refrigerator for at least 5 hours.