Knead the dough on a floured surface until it becomes smooth and elastic.
Let the Dough Rise:
Place the dough in a greased bowl, cover it with a clean cloth, and let it rise in a warm place until it doubles in size (about 1 hour).
Prepare the Cream:
Make the Cream:
While the dough is rising, combine milk, sugar, corn starch, and egg yolk in a saucepan. Cook over medium heat, stirring constantly, until the mixture thickens. Remove from heat and stir in vanilla sugar. Let the cream cool to room temperature.
Assemble the Rolls:
Preheat the Oven:
Preheat your oven to 180°C (350°F). Grease a baking tray or line it with parchment paper.
Shape the Rolls:
Once the dough has risen, punch it down and divide it into equal portions. Shape each portion into a ball and place them on the prepared baking tray.
Brush and Top the Rolls:
Brush the rolls with beaten egg yolk and sprinkle chocolate chips on top of each roll.
Bake the Rolls:
Bake in the preheated oven for 15-20 minutes or