Prepare the Brownie Batter:

• Preheat the oven to 350°F (175°C). Line an 8×8-inch baking dish with parchment paper.
• In a bowl, whisk together melted butter, granulated sugar, and brown sugar until smooth.
• Add the eggs and vanilla extract, mixing until fully combined.
• In another bowl, sift together flour, cocoa powder, baking powder, and salt.
• Gradually mix the dry ingredients into the wet mixture until a thick batter forms.

2. Prepare the Cheesecake Layer:

• In a separate bowl, beat together cream cheese, sugar, egg, and vanilla extract until smooth and creamy.

3. Assemble the Layers:

• Pour half of the brownie batter into the prepared pan and spread evenly.
• Gently pour the cheesecake mixture over the brownie layer.
• Drop dollops of the remaining brownie batter on top and use a knife to swirl the two layers together.

4. Add Oreos:

• Press Oreo cookies gently into the batter.

5. Bake:

• Bake for 30-35 minutes, or until the edges are set and a toothpick inserted into the center comes out with a few moist crumbs.
• Let cool completely before slicing.

6. Serve:

• Slice into squares and enjoy with a glass of cold milk!