GÂTEAU 4 CUILLÈRES! Le Meilleur GÂTEAU au chocolat🍫que j’ai jamais cuisiné ! Fond dans la bouche

4 SPOON CAKE! The Best Chocolate CAKE🍫I've Ever Baked! Melts in your mouth ✅Ingredients: 1 egg a pinch of salt 1 tbsp vanilla flavoring 4 tbsp sugar (80 g) 4 tbsp oil (40 ml) 4 tbsp milk (60 ml) 4 tbsp flour (80 g) 1 level tbsp cocoa powder (20 g) 1 tsp baking powder ———————— 90 ml milk 2 tsp sweetened cocoa powder ———————— 500 ml milk (2 cups) 1 level tbsp flour (20 g) 1 level tbsp cornstarch (20 g) 8 g vanilla sugar (1 tsp) 1 egg yolk 4 tbsp sugar 40 g Butter ————————- 150 g chocolate 75 ml hot single cream ————————- 40 g dark chocolate for decoration