In a large bowl, mix all the ingredients on high speed. Make sure the chocolate is warm and not hot as otherwise the eggs might cook. Mix until you get a soft, creamy, airy dough.
Spoon small amounts of batter into special madeleine or muffin cups. Make sure you leave room for the madeleines to rise.
Bake for 10-15 minutes or longer if you use muffin cups. They should have a porous texture and a golden top when done.
Optional: let them cool completely and decorate with powdered sugar or cocoa.