Preheat Oven & Prepare Baking Sheet:

• Preheat oven to 375°F (190°C).

• Line a baking sheet with parchment paper.

Mix Dry Ingredients:

• In a medium bowl, whisk together all-purpose flour, cake flour, cocoa powder, baking powder, salt, and baking soda. Set aside.

Cream Butter & Sugars:

• In a stand mixer with a paddle attachment, beat cold butter, brown sugar, and granulated sugar on medium speed until light and fluffy (about 2 minutes).

Add Eggs:

• Mix in the whole egg and egg yolk until combined.

• Scrape down the sides and mix again for 30 more seconds.

Incorporate Dry Ingredients:

• Reduce mixer speed to low and add the dry ingredients in three additions, mixing just until combined.

Stir in Peanut Butter Chips:

• Gently fold in the Reese’s peanut butter chips.

Shape & Bake:

• Measure 5.75 oz. of cookie dough per ball.

• Place 4 cookies per baking sheet and bake for 11 minutes.

Cool & Serve:

• Let cookies cool for 10 minutes, then enjoy warm!

• For later: Microwave for 15-20 seconds to restore gooey texture.