1-Preheat your oven to 410°F (210°C). Line a baking sheet with parchment paper or silicone mats for easy cleanup.

2-In a large mixing bowl, cream cold butter and both sugars together for about 4 minutes until light and fluffy. This step is crucial for achieving the perfect texture.

3-Add eggs one at a time, mixing well after each addition. The mixture should be smooth and creamy before proceeding.

4-In a separate bowl, combine dark baking cocoa, cake flour, all-purpose flour, cornstarch, baking soda, and salt. Gradually stir the dry mixture into the wet ingredients until just combined.

5-Fold in 1 1/3 cup peanut butter chips or your desired chocolate chunks. For a fully chocolate experience, you can substitute with dark, semisweet, or milk chocolate chunks.

6-Chill dough for 10 minutes. This brief chilling helps maintain the cookie shape during baking.

7-Divide dough into large balls and place on a lightly colored cookie sheet, pressing lightly on top to smooth them out. The dough yields 8 extra-large cookies, fitting 4 per large sheet.

8-Bake for 8 to 11 minutes or until golden brown on top.

9-Allow cookies to rest for at least 10 minutes to set before serving. This waiting time is essential as it allows the cookies to finish cooking and sets their texture.