Whisk together melted butter, light brown sugar, and granulated sugar to form a paste.
Add one egg and vanilla extract, then whisk until runny and smooth.
Sift in plain flour, cocoa powder, bicarbonate of soda, and salt. Fold these in until just combined.
Fold in milk chocolate chips, white chocolate chips, and dark chocolate chips.
Refrigerate the dough for 30 minutes.
Scoop up two tablespoons of dough and place on a cookie sheet.
Bake in the oven and let them cool before enjoying.
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