200g dark chocolate, coarsely chopped 200g butter, softened 1 cup (200g) brown sugar 3 eggs, at room temperature 1 1/2 cups (225g) plain flour 1/4 cup (30g) Dutch cocoa powder 1 teaspoon baking powder 1/2 teaspoon bicarbonate of soda 1/2 cup (125ml) buttermilk
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