In a large bowl set over a pan of simmering water, melt the butter and the chocolate and mix until smooth. Add the sultanas and nuts and stir together.
In a separate bowl, mix together the flour, baking powder and sugar, then add this to the chocolate mixture. Stir together well, then beat in the eggs and mix to a silky consistency.
Pour the brownie mix into the baking tray, place in the oven and bake for 25 – 35 minutes.
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