Baked Chocolate Mousse

300g dark chocolate, chopped
160ml butter, cubed
6 eggs, separated
30ml + 30ml caster sugar
5ml vanilla

Preheat your oven to 180℃ and line a 22cm loose-bottom cake tin with baking paper.
Add the chocolate and butter to a heatproof bowl set over a saucepan with simmering water.
Stir every now and then until the chocolate is melted and you have a silky smooth mixture.
Take the bowl from the saucepan and set aside.
Add the egg yolks and 30ml caster sugar to a mixing bowl and beat with an electric mixer for 5 minutes.
Pour the chocolate mixture into the egg yolk mixture and mix well. Set aside.
Add the egg whites to a large mixing bowl and whisk until soft peaks.
Add the remaining 30ml caster sugar a little at a time while whisking until you have a thick, glossy consistency.
Stir a third of the egg whites into the chocolate mixture.
Add the rest and gently fold it through.
Add the vanilla and fold it in until your mixture has an even colour without any white pockets of egg white in it.
Spoon the mousse into the prepared cake tin and bake for 30 minutes.
Remove from the oven and cool the cake in the baking tin.
Remove from the tin and sift over some icing sugar to serve.