Heat the oven to 180 degrees.
Put butter, sugar, chocolate (30 grams), cocoa and milk in a saucepan. Bring the mixture to a boil and remove from heat.
When the mixture has cooled down, add the egg and beat it up a little.
Add the flour and baking powder, mix.
Chop the remaining chocolate.
Fill the form with a test for 2/3, then drown in it pieces of chocolate.
Bake for 25 minutes.
Thanks for following.