Preheat oven to 350 degrees. Lightly grease sides of an 8x8 pan and line with enough parchment paper to overhang the sides.
Prepare brownie layer and chocolate chip cookie layer.
Pour the brownie batter into prepared pan first.
Drop large spoonfuls of cookie dough and spread carefully.
Bake for 25-30 minutes.
Cool completely before slicing.
Add butter to a medium saucepan and cook over medium heat until light brown / caramel in color. 5-10 minutes. Make sure to keep and eye on it so butter does not burn. It also helps to use a light colored saucepan for this.
Pour browned butter into a large bowl along with both sugars, cocoa powder, salt, instant coffee granules and baking powder. Stir until combined and allow to rest for 5 minutes or until the mixture has cooled down.
Stir in the eggs and vanilla and mix until batter has a nice sheen to it.
Fold in the flour and chocolate chips and stir until combined. (Do not over mix) Set aside.
!Chocolate Chip Cookie Layer
In a stand mixer with the paddle attachment cream butter and sugars.
Add in egg and vanilla and mix until combined.
In a medium bowl mix together cornstarch, baking soda, baking powder, salt and flour.
Add the dry ingredients on low just until combined. Do not overmix.