INGREDIENTS
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200 g (16 Tbsp) unsalted butter, soft
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80 g (2/3 cup) powdered sugar
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1 tsp vanilla extract
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150 g (1 cup + 2½ Tbsp) all-purpose flour
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70 g (1/2 cup) starch (tapioca or corn starch)
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20 g (1/4 cup) cocoa powder
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50 ml (4 Tbsp) coffee, strong (espresso)