Makes approximately 18 cookies

  • Unsalted butter - 75g, soft
  • Caster sugar - 100g
  • Soft light brown sugar - 70g
  • Egg - 1 large at room temperature
  • Vanilla extract - 1 teaspoon
  • Plain flour - 125g
  • Cocoa - 50g, sieved if lumpy
  • Bicarbonate of soda - 1 teaspoon
  • Fine sea salt - a pinch
  • Dark chocolate chips - 125g
  • Pumpkin seeds - 50g