01 -
Preheat oven to 175°C. Line a large baking sheet with parchment paper or a silicone baking mat and set aside.
02 -
In a medium mixing bowl, whisk together all-purpose flour, baking soda, salt, and baking powder until evenly combined. Set aside.
03 -
In the bowl of a stand mixer fitted with the paddle attachment, beat unsalted butter on medium speed for 1 minute. Add 250 grams granulated sugar and continue to beat until light and creamy, about 2 to 3 minutes, occasionally scraping down the bowl.
04 -
Add the egg, egg yolk, and vanilla extract to the butter mixture. Mix on medium until thoroughly incorporated.
05 -
Add the dry ingredients to the wet mixture. Mix on low speed just until a cohesive dough forms. The dough may appear slightly crumbly at first but will come together.
06 -
Place the remaining 100 grams granulated sugar in a small bowl. Portion the dough into balls, using approximately 2 tablespoons per portion. Roll each dough ball in sugar until fully coated. Arrange onto prepared baking sheet, spacing each piece about 5 cm apart.
07 -
Bake for 10 to 14 minutes, or until the bottoms are lightly golden and the surfaces start to crack. Monitor closely to prevent over-baking; cookies should remain soft and chewy.
08 -
Remove baking sheet from oven and let cookies rest on the tray for 5 minutes. Transfer to a wire rack to cool completely.
09 -
Once cooled, store cookies in an airtight container at room temperature for up to 3 days or freeze in a suitable container for up to 3 months.