Instructions:

• Preheat your oven to 350°F (175°C). Line a 9x13 inch baking pan with parchment paper, allowing some overhang for easy removal later.
• In a large mixing bowl, combine the box chocolate cake mix, 1/2 cup of melted butter, and 1 large egg. Mix until well combined. Spread the mixture evenly into the prepared baking pan using a spatula.
• In another bowl, beat the 8 ounces of cream cheese with an electric mixer until smooth. Gradually add in 1/2 cup of melted butter, 3 large eggs, 1 teaspoon of vanilla extract, and 16 ounces of confectioners' sugar. Beat until light and fluffy.
• Gently fold in the coarsely crumbled Double Stuff Oreo Cookies into the cream cheese filling.
• Pour the cream cheese filling over the chocolate cake layer in the baking pan, spreading it evenly with your spatula. Bake for 30-35 minutes, until the edges are set, and the center is still slightly jiggly.
• Once baked, let it cool completely on a wire rack. For the best results, refrigerate for a few hours before slicing into squares. Garnish with whipped cream and additional Oreo cookies if desired.