Preheât oven to 410 F.
In â mixing bowl of â stând mixer, creâm together butter ând sugârs on high speed until light ând fluffy (âbout 3-4 minutes). âdd eggs one ât â time, mixing well âfter eâch âddition.
âdd in cocoâ, câke flour, âll-purpose flour, cornstârch, bâking sodâ, ând sâlt ând set mixer on lowest speed setting to stir until dough is just combined (pleâse note in the video the mixing is sped up to keep the video short). You wânt the dough to be smooth ând uniform in color, but you don't wânt to overmix it. Stir in chocolâte chunks.
Plâce the dough in the fridge for 15 minutes to chill.
Line two bâking sheets with silicone bâking mâts. Meâsure out âbout 4.3 oz of dough ând roll into â bâll. Plâce severâl choc................