This is my really simple one that I'm always asked to bring to things!

125g cream cheese
1/2 cup sugar
1 egg
250g dark cooking chocolate
600ml thickened cream lightly whipped

1. Beat the cream cheese, sugar and egg until smooth
2. Break chocolate into small pieces and melt
3. Add melted chocolate to cream cheese mixture. Stir through until well combined. Stir in cream. Chill until required.

I usually grate chocolate on top too.