I use a River Cottage recipe if I want something richer than a normal chocolate sponge -
250g dark chocolate (around 70% cocoa solids), broken into chunks
250g unsalted butter, cut into cubes
4 medium eggs, separated
200g caster sugar (or 100g caster mixed with 100g soft light brown sugar)
50g plain flour
50g ground almonds
Grease a 23cm springform tin & line the base.
Melt the chocolate and butter together in a bowl over a simmering pot of water. Remove from heat and leave to cool once melted.
Separate the eggs, and whisk the egg yolks and sugar together in a large bowl.
Stir the melted chocolate into the egg & sugar mixture, then combine the flour and almonds and stir those in too.
Whisk the egg whites until they form stuff peaks. Stir one spoonful in to the chocolate mixture first, then gently fold the rest of the egg white in.
Pour into the tin and bake at 170°C for around 30 minutes, until only just set.
Serve on it's own, with cream / crème fraiche / greek yoghurt, or top with sweetened icing sugar and fruit, or with whisky stirred in.
This is a the best brownie recipe I've ever tried -
110g unsalted butter
120g dark chocolate
200g light muscovado sugar
100g caster sugar
2 large eggs
1 tsp vanilla extract
½ tsp salt
100g plain flour
25g cocoa powder
100g chopped pecan nuts
Line a roughly 23cm² tin with baking parchment or greaseproof paper.
Melt the butter and chocolate in pieces in a bain-marie. Take off the heat, stir in the sugar and leave to cool.
Add the salt and vanilla. Beat the eggs in one at a time, until the mixture is smooth and glossy.
Sift and fold in the flour and cocoa powder, then the nuts. Pour into the lined tin and bake for 20-25 minutes at 200°C.
A knife test should come out with a little goo on the tip when they're done, not clean like with a cake. Remove from the tin after 5-10 minutes and allow to cool completely before cutting them up (they will continue to set too).