01 -
Prepare the chocolate cake in a 23 x 33 cm baking pan according to the package instructions. Allow it to cool completely at room temperature.
02 -
Using the handle of a wooden spoon or the thick end of a chopstick, poke holes into the cake in rows, spacing them 2–3 cm apart.
03 -
Transfer the marshmallow creme and water into a microwave-safe bowl. Microwave for 20 seconds and stir until smooth and pourable. If still thick, microwave for an additional 10 seconds and mix again.
04 -
Evenly pour the marshmallow mixture over the cooled cake, spreading it with a spatula and pressing gently to fill the holes.
05 -
Warm the chocolate fudge sauce according to the manufacturer's instructions. Spread an even layer over the marshmallow-covered cake. Allow to cool completely.
06 -
In a mixing bowl, gently fold the hot chocolate mix into the thawed whipped topping until just combined. Do not overmix.
07 -
Spread the chocolate whipped topping evenly over the cake. Refrigerate for at least 1 hour to allow the flavors to meld.
08 -
Before serving, scatter the mini marshmallows and mini chocolate chips across the top. Slice and serve chilled.