Preheat oven to 350°F,

Mix together Nutella, eggs, milk and oil.

Add cake mix. Stir for 30 seconds on low and then beat for 2 minutes on high.

Pour into two greased 9 inch pans.

Bake at 350°F for 25-30 minutes.

Allow the cakes to cool for a few minutes in the pan before removing them to a wire rack to finish cooling.

Beat softened cream cheese until light and fluffy.

Add Nutella, sugar and vanilla. Beat until smooth.

Fold in a large container of whipped topping.

Store in the refrigerator until ready to use.

Cut the cakes in half horizontally.

Place one of the cake rounds on a platter.

Spread 1/4 of the Nutella mousse onto each of the layers.

Melt frosting in the microwave.

Drizzle over the top of the cake, allowing the chocolate to drip down the sides.

Soften chocolate candy bar in the microwave for a few seconds.

Run a vegetable peeler along the edge of the chocolate bar to make chocolate curls.

Top the cake with the chocolate curls.

Keep refrigerated until ready to serve.