Step 1: Prepare the Pan

Before you begin, prepare your pan for easy removal of the finished cake. Take a 9-inch springform pan. If desired, you can line the bottom with a circle of parchment paper to guarantee the cake won’t stick. Lightly spray the inside of the pan with non-stick cooking spray. This small step is a game-changer, ensuring your beautiful layers release cleanly when you’re ready to serve.

Step 2: Create the Cookie Crust

Place the entire package of chocolate sandwich cookies into the bowl of a food processor. Pulse them until they are broken down into fine crumbs. You should not have any large chunks remaining. If you don’t have a food processor, you can place the cookies in a large, heavy-duty zip-top bag, seal it, and crush the cookies with a rolling pin or the bottom of a heavy pan. It’s a great way to get some aggression out! Once you have fine crumbs, pour them into a medium-sized mixing bowl. Pour the 6 tablespoons of melted unsalted butter over the crumbs. Using a spatula or fork, mix until all the crumbs are evenly moistened by the butter. The mixture should resemble wet sand.

Step 3: Form the Crust Layer

Reserve about ½ cup of the buttered crumb mixture and set it aside. This will be used for a crunchy layer in the middle. Pour the remaining crumb mixture into your prepared springform pan. Using the bottom of a measuring cup or a glass, firmly press the crumbs into an even layer across the bottom and about 1 inch up the sides of the pan. A tightly packed crust is the foundation of a sturdy cake, so don’t be shy with the pressure. Place the pan in the freezer for at least 15-20 minutes to allow the crust to firm up. This is a crucial step to prevent the crust from becoming soggy when you add the ice cream.

Step 4: Soften and Layer the Ice Cream

While the crust is chilling, it’s time to prepare the ice cream. It’s important that the ice cream is softened but not melted. The ideal consistency is spreadable, like thick frosting. The best way to achieve this is to leave the carton on the counter for about 10-15 minutes before you need it. Scoop half of the softened cookies and cream ice cream (about 3 cups) onto the chilled cookie crust. Working quickly, use an offset spatula or the back of a spoon to spread the ice cream into an even layer, making sure it reaches all the way to the edges of the crust.

Step 5: Add the Fudge and Crunch Layer

Retrieve your jar of hot fudge topping. If it’s very thick, you can microwave it for 15-20 seconds to make it more pourable, but be careful not to make it hot, as this will melt the ice cream. Pour about half to three-quarters of the jar of fudge over the first ice cream layer. Gently spread it into a thin, even layer. It doesn’t have to be perfect. Now, take the ½ cup of reserved cookie crumbs and sprinkle them evenly over the fudge layer. This adds a fantastic crunch in the middle of the cake.

Step 6: The First Freeze

Carefully place the cake back into the freezer. Let it freeze for at least 30-45 minutes. This step is vital for ensuring the layers stay distinct. If you add the next layer of ice cream too soon, the fudge and crumbs will mix in, and you’ll lose that beautiful, clean separation between the layers.

Step 7: The Final Ice Cream Layer

After the fudge layer is firm to the touch, remove the cake from the freezer. Scoop the remaining 3 cups of softened ice cream on top. Gently spread it all the way to the edges, creating a smooth, flat top surface. The cake should now be filled to near the top of the pan.

Step 8: The Final Freeze

Cover the top of the springform pan with plastic wrap, pressing it gently against the surface of the ice cream to prevent ice crystals from forming. Then, wrap the entire pan in a layer of aluminum foil for extra protection. Place the cake in the freezer for a minimum of 6 hours, but preferably overnight. This long freezing time is essential for the cake to set completely, ensuring it’s firm enough to slice cleanly.

Step 9: Decorate and Serve

About 30 minutes before you plan to serve, remove the cake from the freezer. Run a thin knife around the edge of the cake to loosen it from the pan. Carefully unlatch and remove the sides of the springform pan. Spread the thawed whipped topping over the top of the cake, creating beautiful swirls with your spatula. Drizzle the remaining hot fudge topping over the whipped topping. For the final touch, take your extra 8-10 chocolate sandwich cookies, roughly chop them, and sprinkle them over the top, along with any mini chocolate chips or sprinkles you’re using. Let the cake sit at room temperature for 10-15 minutes before slicing. This will soften it just enough to make slicing easier without it turning into a melted mess.