Preheate oven to 180°.grease baking tin;line base with butter paper.
Beat butter and sugar in a bowl until light and fluffy.beat in egg yolks.transfer mixture to large bowl;stir in sifted flour and soda.
Add in nuts and and yogurt.
Beat egg whites until soft peaks form.fold egg whites in to yogurt mixture.
Tranfer the mixture into prepared pan.bake cake about 35 minutes.
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