Pain de Chocolat de Bruges

Method

1. Mix flour, sugar, yeast, and salt. Add warm milk and egg, then knead until smooth.
2. Chill the dough for 30 minutes.
3. Roll out the dough, spread cold butter, fold into layers, then chill again.
4. Cut into rectangles, add chocolate, roll, and bake at 200°C (390°F) until golden.