Mix the egg yolks and sugar until the mixure is pale and frothy. Add the cooled chocolate, water, nuts, cream, flour and baking powder; mix until all items are incorporated.
Beat the egg whites to stiff peaks. Gently fold the whites into the chocolate mixture.
Pour mixture into a non-stick baking dish. Bake for 35 minutes.
Cool 10 minutes, remove from dish and cut into bars.
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