Prepare Your Pan by lining a 9x9-inch baking pan with parchment paper and preheating your oven to 350°F (175°C).

Make the Brownie Batter by mixing together the wet ingredients until silky smooth, then gradually incorporating the dry ingredients, followed by folding in crushed Oreo cookies and chocolate chips.

Pour and Spread the brownie batter into your prepared pan, ensuring an even distribution across the bottom.

Add Whole Oreos on top of the brownie batter, pressing them down slightly to blend into the batter while still showing off their spooky decor.

Bake the Brownies for approximately 32 minutes, checking for doneness by inserting a toothpick.

Cool Before Slicing, allowing brownies to cool in the pan for at least 15 minutes before lifting them out and placing on a wire rack.

Slice and Serve the brownies into generous squares after they have completely cooled.