Method

1. 1Step : Mix the softened butter with the sugar, salt, and vanilla. Beat in the egg, then add the flour and chocolate chips. Mix until a dough forms.
2. 2Step : Line a 20 cm tin with parchment paper, then spread out the cookie dough to a thickness of about 0.5cm. Place in the fridge.
3. 3Step : Pour the milk and cream into a saucepan and bring to a boil.
4. 4Step : Whisk the eggs and sugar, then add the cornstarch and salt.
5. 5Step : Pour the boiling milk over the mixture while whisking. Pour the mixture back into the saucepan. Thicken over low heat, stirring constantly.
6. 6Step : Cover with plastic wrap directly touching the surface and let cool.
7. 7Step : Chop the chocolate into a bowl, then pour the cream over it. Stir until all the chocolate has melted.
8. 8Step : When the custard is lukewarm, gently stir it, then pour it over the crust.
9. 9Step : Bake at 180 degrees (th6) for 50 - 60 minutes. When taken out of the oven, let cool on a wire rack without unmolding, then refrigerate overnight.