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Cream butter and sugar with a mixer on high speed until fluff.
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Add flours and combine with hands until you make into a smooth ball of dough.
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Roll into a log and cover with plastic wrap and refrigerate.
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When just firm (not too firm), cut into 1cm portions.
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Bake at 160 C for 12 minutes until just starting to get colour -- not brown or it will be overcooked!