Preheat oven to 350 degrees. Line an 8 x 8 baking dish with enough aluminum foil to have some hang over the sides. Grease and flour the aluminum foil.

Melt butter in a saucepan over medium heat. Once melted allow to cool.

Once cool, whisk in cocoa powder. Whisk in sugar. Once mixed, whisk in eggs one at a time. Whisk in vanilla. Add in flour and salt and mix just until combined. Don't over mix.

Spread half of the batter in the bottom of the prepared pan. Place Oreos in rows of 4. Press gently into brownie mixture. Spread remaining brownie mixture over the top. Bake in preheated oven for 25 - 30 minutes or until a toothpick inserted comes out clean. Place on a cooling rack to cool completely. Slice and serve.