Step 1

Preheat oven to 400°F (204°C). Line two baking sheets with parchment paper and set aside.

Step 2

Using a stand mixer with the paddle attachment, combine cold butter, brown sugar, and granulated sugar. Beat on medium speed until no visible butter chunks remain and the mixture is creamy.

Step 3

Add the egg and egg yolk and mix until combined. Add the vanilla extract and continue mixing, scraping down the sides of the bowl as needed, until combined.

Step 4

In a medium bowl, whisk together flour, cake flour, salt, baking powder, and baking soda.

Step 5

With the mixer on low, gradually add the flour mixture to the wet ingredients. Mix until mostly is incorporated.

Step 6

Add the chocolate chips. Mix just until the flour is fully incorporated and the chocolate chips are evenly distributed.

Step 7

Shape the dough into 8 large balls.

Step 8

Place 4 cookie dough balls onto each lined baking sheet, spacing them out evenly.

Step 9

Bake for about 12-13 minutes, or until the edges are golden brown.

Step 10

Let the cookies cool on the baking sheet for 10 minutes before transferring to a wire rack.

Step 11

Serve warm.