Icebox Cookie

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Icebox Cookie
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[White dough]
120g butter
80g icing suger(sifted)
1 egg york
200g plain flour(sifted)

[Black dough]
120g butter(room temperature)
80g icing suger(sifted)
1 egg york

175g plain flour(sifted)
25g cocoa powder(sifted)
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