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