Sift together cake flour, bread flour, baking soda, and baking powder
Cream together unsalted butter, light brown sugar, and granulated sugar until light and fluffy, about 5 minutes
Add eggs one at a time to the butter mixture
Incorporate vanilla extract and mix for about 10 seconds
Gently fold in the dry ingredients
Gently mix in the bittersweet chocolate wafers
Scoop dough into golf ball-sized portions and slightly squish them down
Wrap tightly with plastic wrap and refrigerate for 72 hours
Preheat oven to 350°F
Sprinkle cookies with flaky salt
Bake for about 14 minutes until edges are golden and crisp
