Step 1

Preheat the oven to 350 degrees F. Line an 8 or 9 inch square pan with parchment paper, leaving an overhang of parchment on both sides. Coat the parchment lined pan with cooking spray.

Step 2

Place the butter and 1 1/3 cups of chocolate chips into a large bowl. Microwave in 30 second increments until just melted. Stir until smooth.

Step 3

Let the chocolate mixture cool for 5 minutes. Whisk in the sugar, then whisk in the eggs, one by one. Finally, whisk in the vanilla extract.

Step 4

Add the flour, cocoa powder and salt to the bowl. Stir gently until just combined.  Fold in 1/3 cup of the remaining chocolate chips.

Step 5

Spread half of the batter in an even layer in the pan. Arrange 16 Oreo cookies on top of the batter.

Step 6

Add the rest of the batter to the pan and spread evenly over the Oreo cookie layer.

Step 7

Coarsely chop the remaining 8 cookies. Arrange the chopped cookies and the last 1/3 cup of chocolate chips over the top of the brownies.

Step 8

Bake for 25-30 minutes until a toothpick inserted into the center comes out with just a few crumbs attached.

Step 9

Let the brownies cool completely.

Step 10

Use the parchment overhang to lift the brownies out of the pan. Cut into squares, then serve.