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  1. Preheat the oven to 180°C/375°F fan. Line a 7.5 x 9.75-inch (19 x 25 cm) rectangular or 9-inch (23cm) square brownie pan with baking paper.
  2. Melt the chocolate and butter together, set them aside.
  3. Whisk together both sugars and eggs until light in colour and fluffy.
  4. Mix together the sourdough starter, the melted chocolate-butter mixture, the salt and the cocoa powder. Stir well to combine. Fold this mixture into your whisked egg-sugar mixture, careful not to knock the air out of it.
  5. Pour into the prepared brownie tin and bake for 25-30 minutes. Remove from the oven and allow to rest for half an hour before cutting them.