Quick delicious dessert with just 1 egg! melts in mouth! so easy that you'll make it everyday

????Ingredients: 1 egg. a pinch of salt. 8g of vanilla sugar. ~ 3/4 cup of sugar (150g). ~1/2 cup of vegetable oil (120ml). ~ 3/4 cup of milk (200ml). ~ 1 and 3/4 cup of all purpose flour (220-230g). ~ 2 and 1/2 teaspoons of baking powder (12g). 1 tablespoon of vinegar (15ml). ~3 tablespoons of Nutella , or any other chocolate spread you prefer. 300g of dark chocolate.