Preheat the oven to 190 ° C. Grease the springform pan. (The cake also works well in a 26 springform pan, but then flattens out.)
Melt the butter, stir in the biscuit crumbs and spread the mixture on the springform pan and press it down. Process the cream cheese, eggs, 100 g sugar and 1/2 bag of vanilla flavor into a smooth mass and spread on the biscuit base.
Bake for 20 minutes, then take out of the oven and let stand for 20 minutes.
Mix the sour cream, remaining sugar and the remaining vanilla flavor in a bowl and spread on the cheesecake.
Bake it for another 10 minutes at the same temperature.
Then let cool and put in the fridge for 8 hours or overnight.