01 -
In a medium bowl whisk together all-purpose flour, cake flour, baking powder, baking soda, and kosher salt. Set aside.
02 -
In another medium bowl, cream together softened butter and light brown sugar until fluffy.
03 -
Mix in the large egg and vanilla extract until just combined.
04 -
Using a rubber spatula, fold the dry ingredients into the wet mixture until fully combined with no visible flour bits.
05 -
Fold in white chocolate chips, semi-sweet chocolate chips, and dark chocolate chips until fully incorporated.
06 -
Chill the dough in the refrigerator for at least one hour or overnight.
07 -
Preheat the oven to 400°F and place the oven rack in the middle position.
08 -
Scoop out large portions of dough (approximately 140g per cookie), roll into balls, and place them on parchment-lined baking sheets.
09 -
Bake for 10-11 minutes, or until the edges are lightly browned.
10 -
Let the cookies cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.