Preheat the oven to 130 ° C. Line the muffin tray with molds.
Put the biscuits in a freezer bag and use a rolling pin to finely crumble them. Then mix with the melted butter. Pour the mixture into the molds and press down firmly. Put in a cool place.
Mix the cream cheese, sugar, salt, eggs, vanilla sugar, sour cream and orange peel to a smooth mass and pour into the molds. Let muffins set in the oven for 35 minutes. Then put in a cool place for 1 hour.
Carefully remove the mini cheesecakes from the paper cases. Spread about 1 tablespoon of sugar on each tart and caramelize with a flambé.