Prepare the base
Arrange ladyfinger biscuits in a single layer in a square or rectangular pan.
Make the cream
In a saucepan, whisk together the egg yolk, sugar, corn starch, and vanilla extract.
Gradually add the milk while whisking to avoid lumps.
Place the pan over medium heat, stirring constantly until the mixture thickens.
Add chocolate
Remove from heat and immediately add the milk chocolate.
Stir until completely melted and smooth.
Assemble
Pour the hot chocolate cream over the biscuits in the pan, spreading evenly.
Chill
Let cool slightly, then refrigerate for at least 2 hours until set.
Finish & serve
Sprinkle with chocolate shavings before serving.
Slice into squares and enjoy!
