Put the eggs into a bowl
Add sugar and mix it well
Then add the flour and baking powder, and mix again
Add the butter previously melted
Beat the dough until it's creamy
Pour into madeleines mold, then put it in the fridge for about one hour.
Preheat the oven at 220°C / 428°F.
Bake for 6 minutes at 220°C / 428°F, then 6 minutes at 180°C / 356°F.
Let it cool then unmold.
Put chunks of chocolate in the mold, then make it melt inside the still hot oven. Once melted, put madeleines in the mold and press it against the chocolate.
Place in the fridge for at least 30 min, so the chocolate can stick well to the madeleines.
Unmold gently, et voilà !