01 -
Preheat oven to 160°C (fan) or 170°C (conventional). Line a baking tray with parchment paper.
02 -
Combine chopped dark chocolate and butter in a heatproof bowl. Set over a pan of simmering water, ensuring the bowl does not touch the water. Gently stir until both are completely melted and smooth.
03 -
In a separate bowl, whisk together caster sugar, light brown sugar, and eggs using an electric mixer on high speed. Beat until the mixture is pale, thick, and airy.
04 -
Pour the melted chocolate and butter into the beaten egg and sugar mixture. Whisk until fully incorporated.
05 -
Sift cocoa powder, plain flour, baking powder, and salt into the wet mixture. Gently fold until just combined, taking care not to overmix.
06 -
Using an ice cream scoop or large spoon, portion the dough onto the prepared baking tray, leaving ample space between each. Optionally sprinkle with sea salt.
07 -
Bake for 12 minutes. Edges should be firm while centers remain soft.
08 -
Allow biscuits to rest on the baking tray for 10 minutes to set before transferring to a cooling rack.
09 -
Once completely cooled, store the biscuits in an airtight container at room temperature for up to 1 week.