Prepare the Pan:

• Preheat your oven to 350°F (175°C).

• Grease a 9×13-inch baking dish with butter or non-stick cooking spray.

Layer the Oreos:

• Spread the Oreo cookies evenly across the bottom of the prepared baking dish. You can break the cookies into smaller pieces, but keep some larger pieces for extra texture.

Add the Sweetened Condensed Milk:

• Pour the can of sweetened condensed milk over the Oreos, spreading it evenly to cover the cookies.

Top with Cake Mix:

• Sprinkle the dry chocolate cake mix evenly over the condensed milk layer. Do not stir or mix; just sprinkle it on top.

Add the Butter:

• Dot the top of the cake mix with sliced pieces of butter. The butter will melt while baking, creating a moist, delicious topping.

Bake:

• Place the baking dish in the oven and bake for 35-40 minutes, or until the top is golden brown and bubbly around the edges.

Add the Whipped Topping:

• Once baked, remove the cake from the oven and let it cool for a few minutes.

• Spread the whipped topping (Cool Whip) over the top of the cake before serving. You can also refrigerate it for a chilled treat!

Serve:

• Serve warm or cold, depending on your preference. Enjoy the Oreo goodness!