01 -
Set your oven to 160ºC (320ºF) with a fan or 170ºC (338ºF) for conventional heating. Prepare a baking tray by lining it with parchment paper.
02 -
In a heatproof bowl, combine the chopped dark chocolate and butter. Place this bowl over a pan of simmering water, making sure the bottom of the bowl does not touch the water. Stir occasionally until the chocolate and butter are fully melted and combined.
03 -
In a separate medium bowl, use an electric hand whisk on high speed to beat the caster sugar, light brown sugar, and eggs. Continue whisking until the mixture becomes very light, thick, and fluffy.
04 -
Gently pour the melted chocolate and butter mixture into the whipped egg and sugar mixture. Whisk well to combine.
05 -
To the wet mixture, sift in the cocoa powder, plain flour, baking powder, and salt. Fold these in until just combined to avoid overmixing.
06 -
With an ice cream scoop, portion the cookie dough onto the prepared baking tray, ensuring ample space between each to account for spreading. Optionally, sprinkle a little sea salt over each dough portion for an extra flavor contrast. Bake in the preheated oven for about 12 minutes. The biscuits should have firm edges and soft centers.
07 -
Leave the biscuits on the tray for approximately 10 minutes after baking. This allows them to set before transferring them to a cooling rack to cool completely.
08 -
Once cooled, store the biscuits in an airtight container at room temperature for up to 1 week.