Melt butter and dark chocolate in a pan over low heat.
Heat oven at 160°C Fan oven.
Chop the white and milk chocolate into little pieces if not already done so.
Sieve flour and cocoa powder in a bowl.
Whisk eggs and sugar in a electric mixer until pale and thick and creamy.
Pour in cooled chocolate mixture in the eggy mousse and slowly mix together.
Add the flour and cocoa powder and fold in slowly until everything is blended in.
Add the chopped chocolate.
Pour evenly into baking tins and bake for 26 minutes
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Notes
If you don't have time to make these, head over to Rachel's Postal Pantry and get them delivered through your letter box in the UK. They make the perfect present plus you can add a personlised message to your loved one.