• Preheat the oven to 350F (180C) degrees.
• Line a 9x13 inch (22 x 33 cm) pan with parchment so the bottom and sides are covered.

Peanut Butter Cookie Layer

• In a large bowl beat together the butter, peanut butter and sugar.
• Beat in the eggs and vanilla extract.
• With the mixer on low speed, beat in the flour.
• Spoon the mixture into the prepared 9x13 inch pan and spread smooth so that the bottom is covered. Use your hands to press it down as needed. You can use a lightly greased piece of wax paper to make this easier if needed.

Orea Layer

• Place the Oreo cookies on top of the peanut butter cookie dough, making 6 rows of 4 cookies.

Oreo Layer

• Add the butter and chopped chocolate to a large heatproof bowl.
• Microwave on medium power for 45 second intervals, stirring between each interval, until smooth.
• Cool for a few minutes, then whisk in the sugar followed by the eggs.
• Gently fold in the cocoa powder, flour, and salt.
• Pour the brownie batter over the Oreo cookie layer.

Baking and Cooling

• Bake in the preheated oven for 50-55 minutes, or until an inserted toothpick comes out with a few damp crumbs. I typically recommend checking around 45 minutes just in case.*
• Remove from the oven and cool the brownies in the pan for at least 4 hours, or until completely cooled.
• Remove from the pan by lifting up the sides of the parchment paper. Place on a cutting board and slice.