01 -
Set the 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 placed over simmering water. Stir occasionally until fully melted and smooth, then mix in vanilla extract.
03 -
Using an electric mixer on high speed, beat the caster sugar, Demerara sugar, and eggs until the mixture is pale, thick, and fluffy, approximately 5 minutes.
04 -
Sift together flour, cocoa powder, baking powder, and salt in a separate bowl, then stir in the chocolate chips to evenly distribute.
05 -
Gently fold the melted chocolate and butter mixture into the whipped eggs and sugars, preserving as much airiness as possible.
06 -
Carefully fold the dry ingredients into the wet mixture with a spatula, mixing just until combined to maintain a light batter.
07 -
Drop tablespoon-sized dollops of batter spaced apart onto the prepared tray. Bake for 12 to 14 minutes until set with a crackly surface.
08 -
Remove from oven and optionally sprinkle with sea salt immediately. Allow to cool on the tray for 10 minutes before transferring to a rack to cool completely.