Assemble the cake: Spread about ⅓ of the cream on the first layer of the cake using an icing spatula then add the second layer and repeat until the third layer.
Decorate the top with the chocolate chips and grated chocolate as you wish.
2 tbsp chocolate chips, 1 tbsp chocolate
Notes
Beating the egg well until fluffy is the secret to a fluffy sponge cake.
I highly recommend using a good quality vanilla extract for a better taste.