Chewy Chocolate Chip Cookie – Cooks Matches

Ingredients

• 280g plain flour
• 1 tsp bicarbonate of soda
• 1 1/2 tsp cornstarch
• 1/2 tsp salt
• 170g unsalted butter
• 150g brown sugar
• 100g granulated sugar
• 1 large egg
• 1 egg yolk
• 2 tsp vanilla extract
• 225 choclate chips