Preheat the oven to 350 degrees F. Line an 8X8 baking pan with parchment paper or foil (line the sides as well).
In a large mixing bowl, whisk the butter, eggs, sugar and vanilla extract until they are well combined.
Slowly stir in the cocoa powder, flour, salt and baking powder. Mix these ingredients in by hand and be careful not to over mix these ingredients.
Then fold in the 1 cup chocolate chips.
Spread half of the brownie batter into the baking dish.
Then layer 16 Oreos on top of the brownie batter in the pan.
Then layer the remaining batter on top of the layer of the oreos.
Crush up the remaining Oreos and place them on top of the final layer of brownie batter and sprinkle the remaining chocolate chips on top too.
Bake for 35-40 minutes until a toothpick insert into the brownies comes out clean.
Allow for the brownies to cool in the pan on a wire rack.
Cut and enjoy!