Method
Preparation
Prepare the chocolate cake according to package instructions and let it cool completely.
In a large bowl, whisk together the instant pudding mix and milk until well combined. Set aside to thicken.
Assembly
In a serving dish, crumble half of the cooled chocolate cake into the bottom layer.
Layer half of the pudding mixture over the crumbled cake.
Pour a generous layer of hot fudge sauce on top of the pudding.
Spread half of the Cool Whip evenly over the fudge layer.
Crumble half of the Oreo cookies on top of the Cool Whip layer.
Repeat the layers with the remaining cake, pudding, hot fudge, Cool Whip, and Oreos until all components are used.
If desired, decorate the top with gummy worms for a fun finish.
Cover and refrigerate for at least two hours before serving to let the flavors meld together.
Notes
You can substitute a store-bought chocolate cake with homemade chocolate cake, or use brownies for a richer flavor. You can also add layers of fruit like strawberries or bananas for a fresh contrast.