Cut the puff pastry into 9 rectangles (approx. 8 x 13 cm) and press into 9 hollows of a greased muffin tin.
Bring the milk, vanilla pulp and sugar to the boil. Mix the cornstarch with 2 tablespoons of water and stir into the boiling vanilla milk. Bring to the boil again and remove from the stove. Mix the egg yolks with a whisk, then stir in the vanilla milk.
Pour the vanilla cream into the puff pastry wells while it is still hot and bake in the oven at 180 ° C for about 20-25 minutes. Then let them cool completely before removing them from the muffin pan.