Prepare Yeast Mixture: In a small bowl, sprinkle active dry yeast over lukewarm milk and let it sit for about 10 minutes until frothy.

Make Dough: In a large mixing bowl, combine all-purpose flour, granulated sugar, and salt. Pour the yeast mixture into the dry ingredients, followed by the large egg, softened unsalted butter, and vanilla extract. Mix until a smooth and elastic dough forms.

Knead Dough: On a floured surface, turn out your dough and knead it for about 8-10 minutes, incorporating the chopped chocolate towards the end.

First Rise: Place the kneaded dough in a greased bowl, cover, and allow to rise in a warm area until it doubles in size, about 1-2 hours.

Divide & Shape: Punch down the dough, divide into 8 portions, shape into ovals, and let rise again for 30 minutes.

Preheat Oven: During the final rise, preheat your oven to 350°F (180°C).

Egg Wash & Cut: Mix egg yolk with milk, brush the tops of the buns, and snip small triangles for decoration.

Bake: Place in the preheated oven and bake for 15-20 minutes until golden brown.

Cool & Serve: Remove from the oven and let cool slightly on a wire rack before enjoying.