110g plain chocolate, broken into pieces
110g plain flour sifted
225g caster sugar
2 eggs, beaten
1/2 teaspoon baking powder
Optional: chocolate chunks (we prefer white chocolate)/walnuts etc...
The original recipe that this came from says this amount feeds 8-10 people. They did not base that estimate on my capacity for chocolate. Doubling the quantities yields a decent amount suitable for sharing at conventions.
Preheat the oven to 180°C/350°F/Gas 4.
Put the chocolate & butter in a heatproof bowl. Stand the bowl over a saucepan of gently simmering water until it melts. Chocolate burns really easily so never melt it over a direct heat & make sure that the bottom of the bowl doesn't touch the water in the saucepan.
When melted take the bowl off the heat & stir in all the other ingredients. The more consistent your mixture is the better the results.
Spread the mixture into a greased 18*28cm (7*11 inches in old money) baking tray & bake in the preheated oven for 30 minutes. Don't overcook it or you will lose the nice fluffy texture. The best way to tell whether it is done or not is to gently poke a knife into the centre then pull it out. If the blade has gooey chocolate on it then it needs a bit more baking, if it's clean it's done.
Leave it to cool in the baking tray for 10 minutes (it will sink a little bit). Cut into pieces as desired & leave to cool on a wire rack.