Preheat the oven to 350°
Spray or butter a 9x13 pan
In a stand mixer or hand mixer on high speed, cream both sugars and butter together until fluffy, about 3 minutes. Lower the speed to low and add in the vanilla and 1 egg at a time, mixing well after each added egg.
Turn off mixer and scrap the sides of the bowl with a spatula. On low speed add the flour, corn starch, baking powder, and salt. Increase speed and mix for about 1-2 minutes. Add the chocolate chips and with a sturdy spoon mix until all incorporated.
Scrap the brownie mixture into the prepared pan and spread it evenly.
Bake until the edges are golden and the toothpick inserted in the center comes out clean, 35-40 minutes.
Let cool for 20 minutes and then cut.
Store in a air tight container for up to 5 days.Happy Eating!!