01 -
Set oven to 160°C (320°F) fan-assisted or 170°C (338°F) conventional. Line a baking tray with parchment paper.
02 -
Combine chopped dark chocolate and butter in a heatproof bowl. Place over simmering water (double boiler method), ensuring the bowl doesn't touch the water. Stir occasionally until fully melted and smooth. Add vanilla extract and mix well.
03 -
In a medium bowl, beat caster sugar, demerara sugar, and eggs with an electric hand whisk on high speed for about 5 minutes until the mixture becomes light, thick, and fluffy with a ribbon-like consistency.
04 -
Sift flour, cocoa powder, baking powder, and salt into a separate bowl. Add chocolate chips and toss to coat, which prevents lumps and ensures even distribution.
05 -
Gradually fold the melted chocolate mixture into the whipped egg mixture using gentle, deliberate strokes to maintain the airiness.
06 -
Carefully fold the dry ingredients into the wet mixture using a spatula, mixing just until combined to preserve the batter's lightness.
07 -
Scoop tablespoons of batter onto the prepared baking tray, spacing them well apart to allow for spreading. Bake for 12-14 minutes, until the brookies develop a crackly top and are set around the edges.
08 -
Immediately sprinkle with sea salt if desired. Allow to cool on the baking tray for 10 minutes before transferring to a wire rack to cool completely.