Line a baking tray with baking paper and roll out the puff pastry on it. Poke holes in the dough with a fork at regular intervals of about 2cm/¾in. Then place in the oven and bake for about 15 minutes until golden brown. Remove and leave to cool.
In the meantime, take a large bowl to hand and whip the liquid cream with a hand mixer until stiff.
Then add ricotta, sugar and vanilla sugar to the whipped cream and gently fold in with a dough scraper. Now add about ⅔ of the chocolate chips and mix well.
Put the cream in the refrigerator for about 2 hours to harden.
Then cut the baked puff pastry into three equal strips. Place the first pastry strip on an oblong plate or serving platter. Then spread half of the cream evenly on top and cover with the second pastry sheet. Spread the remaining cream on top and finish with the last pastry sheet.
Before serving, sprinkle with powdered sugar and decorate with the remaining chocolate chips.Buon appetito!