Step 1

Preheat the oven to 350F (180C) degrees.

Step 2

Line a 9x13 inch pan with parchment paper and leave an overhang around the sides.

Step 3

Beat together the melted butter, brown sugar and white sugar.

Step 4

Beat in the eggs and vanilla extract.

Step 5

With the mixer on low speed, beat in the flour and salt.

Step 6

Turn off the mixer and stir in the chocolate chips using a rubber spatula or wooden spoon.

Step 7

Spoon the mixture into the prepared pan, and spread smooth with a spatula.

Step 8

Place the Oreo cookies on top of the cookie dough pressing them down just slightly. I got 6 rows of 4 cookies.

Step 9

Add the butter and chocolate to a large heatproof bowl. Microwave on medium power for 45 second intervals, stirring between each, until melted.

Step 10

In a separate bowl, whisk together the eggs and sugar.

Step 11

Whisk the chocolate mixture into the egg mixture.

Step 12

Gently fold in the flour, cocoa powder and salt using rubber spatula or wooden spoon.

Step 13

Pour the brownie batter over the Oreo cookie layer, and spread the top smooth as needed.

Step 14

Bake the brownies in the preheated oven for 50-55 minutes, or until an inserted toothpick comes out dry or with a few damp crumbs. If you notice the top is starting to burn, cover with aluminum foil and continue baking. I first check my brownies at 45 minutes just in case.

Step 15

Cool the brownies fully (at least 4 hours) before slicing for clean, even cuts.

Step 16

Store leftovers at room temperature in an airtight container for up to 4 days.