1. Preheat oven to 350 degrees. Grease a 9×9 baking dish or line with parchment paper and set aside. 2. For the brownie layer: In a medium mixing bowl, whisk the eggs, brown sugar, and granulated sugar until smooth. Mix in the oil. Add the cocoa powder, flour, and salt and stir until just combined. Transfer the batter to the baking dish spreading it evenly then set aside.
3. For the chocolate chip cookie layer: In a medium bowl, whisk together the flour, baking soda, and salt. Set aside. Then beat the butter, brown sugar, and white sugar together in a separate medium bowl until there are no clumps. Whisk in the eggs, pour the dry ingredients in, and mix until just combined. Lastly, fold in the chocolate chips.
4. Scoop and gently drop the chocolate chip cookie batter atop the brownie batter. Use your hands to gently spread the cookie batter out.
5. Bake for 35-45 minutes or until the edges begin to brown and a toothpick inserted into the center comes out clean. ***After just 35 minutes the center will still be quite gooey so if that’s your preference make sure not to let them go much longer than that. Remove from oven and allow to cool before slicing (or if you’re like me don’t!).