In a mixing bowl, add cocoa, cake flour, all-purpose flour, cornstarch, baking soda, baking powder and salt and whisk together. Set aside.1 cup (120 g) Cake Flour ½ cup (42 g) Dutch process Cocoa powder 1½ cup (180 g) All-Purpose Flour 1 teaspoon Cornstarch 1 teaspoon fine sea salt ¾ teaspoon Baking Soda ¼ teaspoon baking powder
In your stand mixer fitted with a paddle attachment, cream together cold butter and sugars until light and fluffy, about 4 minutes. Mix on low speed to start then gradually increase to medium speed. Add eggs one at a time, mixing well after each addition. Add vanilla and beat to combine. 1 cup (226 g, 2 sticks) Cold Unsalted Butter 1 cup (213 g) packed light brown Sugar ½ cup (99 g) granulated white sugar 2 large eggs 2 teaspoons vanilla extract
Add in the cocoa dry mixture and stir until combined. Stir in semisweet chocolate chips. 2 cups (340 g) Semisweet Chocolate Chips
Using a large cookie scoop scoop dough (about 5 1/2 ounces or 1/2 cup each). Freeze for 1 hour.
Position a rack in the center of the oven and preheat the oven to 400°F (225°C). Line a baking sheet with parchment paper.
Place 6 cookie dough balls on lightly colored cookie sheet spaced about 2-3 inches apart.
Bake for 10-12 minutes or until set on the top. Let them rest for at least 10-15 minutes to set then transfer to a wire rack to cool completely.