1.Preheat oven to 200°C (180°C fan-forced). Grease a 18cm x 28cm slab pan and line with baking paper.
2.In a heatproof bowl, combine butter and chocolate. Stir over a saucepan of simmering water (bowl must not touch the water) until just melted. Remove from heat.
3.Sift together flour, cocoa powder and baking powder into a medium bowl. Stir in the caster sugar. Add the eggs and chocolate mixture and stir with a wooden spoon until just combined.
4.Spread into prepared pan and bake for 25-30 minutes or until crumbs cling to a skewer inserted in the centre. Place immediately in the fridge until cooled. Cut into squares and serve at room temperature dusted with cocoa powder.
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