Preheat oven to 350 degrees Fahrenheit. Grease a 9x13 inch pan or line it with parchment paper.

Combine the butter and chocolate in a microwave safe bowl and heat in 20-30 second increments, stirring well after each until melted and smooth.

Add the sugar and whisk until combined.

Add the eggs and vanilla extract and whisk together to combine.

Add the cocoa, flour and salt and stir with a rubber or wooden spatula until well combined.

Stir in the chopped Oreos.

Spread the batter evenly into the prepared pan, then bake for 25-30 minutes.

Set the brownies aside to cool. When mostly cool, make the cookies and cream layer.

Add the white chocolate chips and heavy whipping cream to a large microwave safe bowl and heat in 20-30 second increments, stirring well after each until melted and smooth.

Stir in the powdered sugar and chopped Oreos, then spread evenly on top of the brownies.

Allow the brownies to cool completely, then cut into squares.

Store the leftover brownies in an airtight container at room temperature for up to a week.