01 -
In a medium bowl, whisk together the flour, corn starch, baking soda, and salt until evenly distributed.
02 -
In a large mixing bowl, combine the melted and cooled butter, light brown sugar, and granulated sugar. Mix until the sugars are completely dissolved.
03 -
Add the egg and vanilla extract to the butter-sugar mixture. Mix on low speed just until incorporated.
04 -
Gradually add the dry ingredients into the wet mixture, mixing on low speed until just combined. Avoid over-mixing.
05 -
Add the semi-sweet chocolate chips, chocolate chunks, and grated dark chocolate. Fold gently until chocolate is evenly distributed.
06 -
Cover the bowl with cling film and refrigerate the dough for at least 1 hour to firm.
07 -
Preheat oven to 175°C. Line baking sheets with parchment paper.
08 -
Roll chilled dough into 2.5 cm balls and place on the prepared baking sheets, spacing them at least 5 cm apart. Press extra chocolate chips on the surface if desired.
09 -
Bake for 8–10 minutes or until the edges are just golden and the centers appear underdone.
10 -
Allow cookies to cool on the baking sheet for 10 minutes, then transfer to a wire rack to cool completely. The cookies will set as they cool.
11 -
Once fully cooled, store cookies in an airtight container for up to 1 week or freeze for extended storage.