Put the cottage cheese, sugar and vanilla sugar, a pinch of salt, the zest and juice of one lemon, cornstarch, melted butter and yogurt into a bowl. Blend well until smooth with an immersion blender or fork.
Add the eggs one at a time and beat the mixture with a whisk.
Crush the cookies into crumbs, add the milk and spread the mixture over the bottom of an 18 cm pan lined with parchment.
Pour the cottage cheese mixture over the top and bake for 85 minutes in an oven preheated to 160 C.
Let the bake cool completely in the oven, then refrigerate overnight - breakfast is ready in the morning. Enjoy!