Preheat your oven to 200°C / 410°F. Line three baking sheets with baking paper. Set aside.
Add the cocoa powder, all-purpose flour, cake flour, baking soda, cornstarch and salt to a small mixing bowl and use a whisk to combine. Set aside.
Add the butter and sugar into a large mixing bowl. Use an electric hand mixer to cream until pale and fluffy. About 3 minutes. Add the eggs one at a time and mix each time until well combined. You’ll want to scrape down the bowl before you add each egg. Add the dry ingredients and use a wooden spoon or spatula to mix everything until a dough forms and no dry ingredients are showing. Add the peanut butter chips and mix until evenly distributed in the dough.
Use a large ice cream scoop (holds 3 tbsp) to double scoop balls of dough. So all up the dough balls will be 6tbsp in size. You don’t want to shape these into balls, leave them a rough ball shape but flatten slightly before baking. Add 4 cookies on each tray before baking. Bake for 7 minutes. Cookies will be very fudgy and soft when they come out of the oven. Let them cool completely on the tray before serving.
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Notes
StorageCookies can be stored in an airtight container for up to three days.Chocolate ChipsYou can use any flavoured chocolate chips for this cookie. White, milk, or dark chocolate will also work.