Separate the eggs and put the whites and yolks in different bowls
Melt 125g dark chocolate in a basin over boiling water.
When it has melted add the peanut butter, sugar and egg yolks. Stir until smooth.
Whisk the egg whites until they form stiff peaks.
Gently fold the egg whites into the chocolate mixture.
Transfer into a clean bowl, cover with clingfilm and put in the fridge to set for at least three hours.
When the mousse is firm pipe into egg cups and use a knife to shape into an egg shape.
Place back in the fridge for a couple of hours.
Melt the rest of the chocolate in a basin over boiling water.
Leave to cool. When it has cooled drizzle the chocolate over the top of the mousse.
Decorate with sugar sprinkles and chopped peanutes.