Add eggs and sugars
Whisk the eggs and sugar until it's foamy
Add flour and continue to whisk
Put the chocolate and butter in a small pan and melt over low heat
Mix the melted chocolate with cake mixture with a spatula and butter the cassolettes
Pour the mixture into cassolettes and place these in a glass pyrex with some water in it
Put the pyrex into a preheated oven and bake for 17 minutes at 180 degrees
Wait for 2 minutes after taking out from the oven