Mix and bake chocolate cake in a 9x13-inch pan according to box instructions.
One box devils food cake mix
Use the handle of a wooden spoon or a large straw to poke holes into the cake; set aside.
In a mixing bowl, whisk together 1 packet of the instant chocolate pudding and 2 cups of cold milk.
Two 3.9 ounce boxes instant chocolate pudding mix, 3 cups milk
Once the pudding is thickened, spoon it over the cake, then place in the fridge to chill for an hour.
In a large mixing bowl, whisk together the other box of pudding mix, powdered sugar and remaining one cup of milk.
1/2 cup powdered sugar
Fold in the whipped topping then spread over the cake.
One 8 ounce tub whipped topping
Refrigerate the cake for at least an hour before serving. Better yet, let it chill overnight!
Top the cake with chocolate syrup and chocolate shavings, if desired, and serve!
chocolate syrup and chocolate shavings