Preheat the oven to 350℉. Line a 9x9-inch baking pan with parchment paper.

In a mixing bowl, whisk together the melted butter and sugar until combined. Add the vanilla extract and eggs and whisk well. Lastly, add the cocoa powder and flour and whisk until smooth.

Pour into the prepared baking pan. Bake in the preheated oven for 25-32 minutes or until no longer jiggly in the center. Let cool completely before topping with the topping layer.

Using an electric mixer, whip together the heavy cream and instant vanilla pudding powder until fluffy and smooth. Fold in the chopped Oreo cookies. Spread evenly over the completely cooled brownies. Enjoy!