Roll 2/3 of the brioche dough into a long rectangle. Sprinkle ¾ of the dark chocolate into the center and roll it into a log. Shape it into the reindeer’s body and place it on a baking sheet lined with parchment paper.
Take about 2/3 of the remaining brioche and roll it out into a circle shape. Place the remaining dark chocolate in the center and seal the dough closed to create a bun. Shape it into the reindeer’s head and attach it to the body. Use the remaining dough to make the feet, nose and antlers. To make the antler, make 2 little logs of dough and trim the edges with scissors to create a scalloped pattern. Attach these to the reindeer. Stick the raisins onto the reindeer to make its eyes. Cover with a damp dish cloth and let rise for 1 hour. Brush the entire surface with a beaten egg.
Bake the brioche at 350F for 35-40 minutes until golden brown. Remove from the oven and let slightly cool. Spread the red-coloured chocolate onto the nose and enjoy!