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In a mixing bowl of a stand mixer, cream together butter and sugars on high speed until light and fluffy (about 3-4 minutes). Add eggs one at a time, mixing well after each addition. Use your spatula to scrape the sides of your mixing bowl between each egg addition, to make sure all the batter is incorporated.
Add in cocoa, cake flour, all-purpose flour, cornstarch, baking soda, and salt and set mixer on lowest speed setting to stir until dough is just combined. You want the dough to be smooth and uniform in color, but you don't want to overmix it, so this should only take a few revolutions and less than 30 seconds. Stir in 1 cup of chocolate chips (reserve the remaining 1/3 cup).
Place the dough in the fridge for about 30-60 minutes to chill. You want the dough to be cold (but not to the point that it's hard) so it's less sticky to work with and won't spread too much in the oven.
Preheat oven to 410°F.
Line two baking sheets with silicone baking mats. Using your hand, loosely scoop out 4.5 oz of dough (weigh this out or you can try to divide dough evenly into 8 sections but it's best to weigh it out so that the cookies all cook evenly) and then flatten dough into a disc. The dough will be sticky but should be workable. Using an 1.5 tbsp cookie scoop, add 1.5 tbsp of Nutella to the center of your disc. Then carefully wrap your disc around the Nutella, forming a ball. Make sure that the Nutella is completely covered and there are no cracks in your dough. Repeat with remaining dough and Nutella. You will place four cookie balls on each baking sheet, spaced about 2 inches apart. Lightly press about 5-6 chocolate chips to the surface of each ball.
Place one baking sheet into the middle of the oven and place the remaining one in the fridge. Bake the cookies for about 11 minutes, or until the surface is dry and cookies look almost set, but may still be slightly darker in the middle. Remove from oven and remove other baking sheet from fridge and bake remaining cookies for about 11 minutes. After you remove the cookies from the oven, they need to cool directly on the cookie sheet and set. Do not remove cookies before they are set otherwise they will break. Allow cookies to cool at least 20 minutes. Once cookies have cooled and set, remove and enjoy.