Preheat oven to 170C.
Line bottom and sides of a 6x3 inch round baking pan with parchment paper
Melt chocolate in a bowl over pot of simmering water then let cool. set aside
Put eggs in the bowl of your mixer and using a whisk attachment, beat the eggs until its light, fluffy and pale and can hold shape.
Add a little (about 2 tablespoons) of whipped eggs to the cooled melted chocolate and gently fold to lighten the mixture.
Fold the rest of the eggs to the chocolate and pour into the prepared pan.
Bake in the pre-heated oven for about 35 minutes.
Take off the oven and let cool for about 5 minutes.
Peel off the parchment paper and cool cake completely before serving.
Optional: dust some powdered sugar over the cake before serving.