Step 1

Preheat your oven to 375 degrees F. Line a baking sheet with parchment paper. Set aside.

Step 2

Combine the all-purpose flour, cake flour, cocoa powder, baking powder, salt, and baking soda in a medium sized bowl. Whisk together. Set aside.

Step 3

In a stand mixer fitted with the paddle attachment, combine the cold butter and sugars and beat on medium speed until light and fluffy, about 2 minutes.

Step 4

Add the whole egg and egg yolk and mix until combined. Scrape down the sides of the bowl and mix again for about 30 more seconds.

Step 5

Turn the mixer on low speed and add the dry ingredients in three separate additions, only mixing until the dry ingredients are incorporated.

Step 6

Stir in the peanut butter chips.

Step 7

Measure 6 oz. of cookie dough and shape into balls. Place 4 cookie dough balls on the baking sheet and bake for 11 minutes. There should be enough dough for seven 6 oz. cookie dough balls and one that is about 4 oz.

Step 8

Let the cookies cool for about 10 minutes and then serve while still warm. To eat later, heat a cookie in the microwave for about 15-20 seconds.