Preheat your oven to 375. Line baking sheet with parchment or non stick spray lightly.
Combine flour, cake flour, cocoa powder, baking powder, baking soda and salt. Mix well and set aside.
In your mixing bowl, add cold butter cubes and sugar. Beat on medium until it forms a well combined cream-should take no more than 2 minutes.
Add in your eggs and mix until combined. If it's getting sticky, make sure you are scraping the sides.
Turn your mixer down to a lower speed and slowly add your dry ingredients in batches. You want to make sure to not mix too long.
Once it's done, stir in your peanut butter chips and fold until well combined.
Place your mixing bowl in the fridge and cover with a wet towel. Leave for 30 minutes.
Time to make your balls! The dough should yield about 8 big dough balls. They will seem HUGE. You wont have space to cook all of them at once. Cook 4 at a time. Bake for 12 minutes.