Preheat your oven to 350°F (180°C) and line a baking pan with parchment paper. TIP: Grease the parchment paper with oil to prevent the cake from sticking.
In a large bowl, whisk together the flour, baking powder, and cocoa powder. TIP: Sift the dry ingredients to ensure a smooth cake batter.
In another bowl, cream together the butter, sugar, and vanilla sugar until light and fluffy. Add the eggs one at a time, mixing well after each addition.
Melt the dark chocolate and stir it into the butter-egg mixture.
Gradually add the dry ingredients to the wet ingredients, alternating with the milk, until a smooth batter forms. TIP: Be careful not to overmix, to keep the cake tender.
Pour the batter into the prepared baking pan and spread it evenly. TIP: Use a spatula to distribute the batter evenly.
Bake the cake for 25-30 minutes, or until a toothpick inserted into the center comes out clean. TIP: Avoid opening the oven during the first 15 minutes to prevent the cake from collapsing.
Let the cake cool in the pan for 10 minutes, then transfer it to a wire rack to cool completely.
Dust with powdered sugar and slice. TIP: Serve with melted chocolate or whipped cream for an extra treat.
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