INGREDIENTS
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115 grams (1/2 cup / 1 stick) unsalted butter, softened
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90 grams (1/2 cup) brown sugar, firmly packed
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70 grams (1/3 cup) caster sugar
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1 teaspoon vanilla extract
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1 large egg
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140 grams (1 cup) plain flour
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25 grams (1/4 cup) regular cocoa powder
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25 grams (1/4 cup) dutch processed cocoa powder*
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1/2 teaspoon baking soda
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1 teaspoon cornflour
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2 tablespoons milk
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100 grams (1/2 cup) plain M&M's, plus extra for decorating.