1.Preheat the oven to 160°C/140°C fan-forced. Grease a 19cm x 30cm lamington pan; line base and long sides with baking paper, extending paper 5cm over edges.
2.Combine butter and chocolate in a medium saucepan; stir over low heat until smooth. Cool for 10 minutes.
3.Stir in sugar and eggs, then sifted flours, nuts and chocolate bits into chocolate mixture. Spread mixture into pan. Bake for about 30 minutes. Cool slice in pan before cutting. Dust with sifted icing sugar, to serve.
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