01 -
In a medium sized bowl, whisk together all-purpose flour, cornstarch, baking powder, and salt. Set aside.
02 -
Using a stand mixer fitted with the paddle attachment or a large bowl with a handheld electric mixer, beat unsalted butter, granulated sugar, and brown sugar on medium-high speed until well blended.
03 -
Add ube jam and ube extract to the mixture and continue beating until combined.
04 -
Beat in the egg and egg yolk until well combined.
05 -
Add the dry flour mixture to the wet ube mixture in thirds. Beat after each addition until no more streaks of flour remain, scraping the sides and bottom of the bowl as needed.
06 -
Stir in the white chocolate chips. Cover the bowl with plastic wrap and chill the dough for at least 3 hours.
07 -
Preheat your oven to 175°C (350°F) and line a baking sheet with parchment paper.
08 -
Scoop about 2 tablespoons of dough and roll into balls. Place onto the prepared baking sheet about 2 inches apart.
09 -
Bake the cookies for 10-11 minutes or until just set. Remove from the oven and allow to cool completely on the pan.
10 -
While the cookies are warm, gently press a few extra pieces of white chocolate chips on top for decoration. Note that this step slightly increases sweetness.