Ingredients
Method
- Add the cubed butter to a saucepan and melt over medium-high heat. Let it foam and brown for 4–5 minutes until golden and nutty. Transfer to a heatproof bowl and cool for 40–45 minutes.
- Whisk together the flour, cornflour, baking powder, baking soda, and salt in a separate bowl.
- Stir the cooled brown butter with both sugars until glossy. Add the egg, egg yolk, and vanilla, mixing until smooth and caramel-like.
- Add the dry mix to the wet and stir until mostly combined. Fold in both chocolates. Divide into 8 × 155g portions, roll into balls, and flatten into 1.5-inch discs.
- Refrigerate the dough discs for 12–24 hours (up to 48 hours) to deepen flavor and prevent spreading.
- Preheat oven to 180°C / 350°F. Line a tray with parchment. Bake 4 cookies at a time for 17 minutes, until edges are golden. Press extra chocolate chips on top while hot and cool for 20 minutes.
- Serve warm for gooey centers or cool completely before storing.
Notes
Chilling is essential for thick, bakery-style cookies. Mix dark and milk chocolate for balanced richness. For smaller cookies, make 16 × 75g balls and bake 12–13 minutes.
