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Preheat the oven to 180°C (350°F) and grease a medium cake tin or line it with parchment paper.
In a mixing bowl, whisk together the egg and sugar until light and creamy.
Add the vanilla sugar, oil, and soft butter. Mix until smooth.
Sift in the flour, baking powder, and cocoa powder. Mix gently.
Gradually add the milk, stirring until the batter is smooth and lump-free.
Pour the batter into the prepared tin and bake for 25–30 minutes, or until a toothpick inserted in the center comes out clean.
Let cool in the pan for 10 minutes, then transfer to a rack to cool completely.
If using glaze: melt the chocolate with cream over low heat, stir until smooth, and pour over the cooled cake.
Serving and storage tips:
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