Preheat your oven to 175°C (350°F). Grease a 27 x 18 cm baking mold.

In a large mixing bowl, whisk together the eggs, a pinch of salt, and vanilla sugar.

Add the sugar and mix until well combined.

Gradually add the sunflower oil and milk, mixing continuously.

Sift in the flour and baking powder, and mix until the batter is smooth.

Pour the batter into the prepared mold and spread it evenly.

Drop spoonfuls of Nutella on top of the batter and swirl it gently with a knife to create a marbled effect.

Sprinkle the flaked almonds and chocolate chips evenly over the top.

Bake in the preheated oven for 35 minutes or until a toothpick inserted into the center comes out clean.

Allow the cake to cool before slicing and serving.