Preheat your oven to 350°F (175°C). Grease and flour a 9-inch springform pan.
Prepare the cake mix according to package directions.
Pour the batter into the prepared springform pan and bake in the preheated oven for 45 to 50 minutes or until a toothpick inserted into the center comes out clean.
Let the cake cool completely before assembling the ice cream cake.
Carefully level the cake using a serrated knife. Discard the top of the cake.
Spread the fudge sauce over the vanilla ice cream layer. Sprinkle the cereal or candy evenly on top of the fudge sauce. Freeze for 30 minutes.
Remove the cake pan from the freezer and spread the chocolate chip cookie dough ice cream over the fudge layer. Smooth the top with a spatula. Freeze for at least 2 hours, or until firm.
Once the ice cream cake is completely frozen, carefully remove it from the cake pan and transfer it to a serving platter.
Frost the entire cake with whipped topping.
Sprinkle the chocolate chip cookie dough pieces evenly on top.
Drizzle the melted chocolate chips over the top of the ice cream cake.
Return the cake to the freezer for 30 minutes to allow the chocolate drizzle to set.
When ready to serve, slice the ice cream cake into wedges using a warm knife and enjoy!