1. To begin, preheat your oven to 350. Line a 9x9 pan with parchment paper (with two ends sticking out) for easy removal.

Brownie Layer

1. To a medium mixing bowl, add your butter and sugar and beat together with a mixer till creamy. Add your eggs and vanilla and briefly blend them in.

2. To the same bowl, add your flour, cocoa powder and salt. Mix together till you have a smooth brownie batter.

3. Spread into the bottom of your pan in a thin, even layer.

Cookie Layer

1. To a large mixing bowl, add your butter, white sugar and brown sugar and beat together with a mixer till creamy. Add your egg and vanilla and briefly blend them in.

2. To the same bowl, add your flour, baking soda and salt. Mix together till you have a thick cookie dough. Add your chocolate chips and fold them in.

3. Crumble all of the cookie dough across the top of the brownie batter layer (or scoop the dough in a cookie scoop, flatten it out in your hands and place it on top of your brownie batter. Repeat till you have used all of the cookie dough).

4. Cover with aluminum foil. Bake in the oven for 35 minutes. Remove the foil, and bake another 10-15 minutes (when you gently shake the pan back and forth the center should only lightly jiggle).

5. Let cool entirely before cutting.

6. Cut into 16 bars. Devour!