Preheat the oven to 175 degrees.
Whisk the eggs, sugar and vanilla together until the mixture is pale and fluffy. Melt the dark chocolate in a bain-marie.
Mix the remaining ingredients thoroughly to form a thick batter.
Gently fold the egg mixture into the batter, followed by the melted chocolate.
Place the batter in a greased baking tin or one lined with baking paper and bake in the middle of the oven for 30–40 minutes. The baking time depends on the oven and on how you like your cake; ideally, it should be soft in the middle.
Allow the cake to cool before serving.
Enjoy!
