Preheat oven to 200ºC. Line a muffin tin with Multix Coloured Patty Pans.
Combine self raising flour, cocoa powder, caster sugar and dark or milk chocolate bits in a large bowl. Make a well in the centre.
Add milk, butter, eggs and vanilla essence to the well. Using a large metal spoon, stir gently until just combined.
Spoon mixture into prepared patty pans. Bake for 12-14 minutes, or until a skewer inserted into the centre comes out clean.
Leave cupcakes in the tin to cool for approximately 5 minutes, then transfer to a wire rack to cool completely.
Place dark chocolate and cream in a heatproof bowl set over a saucepan of simmering water. Stir until smooth. Remove from heat and refrigerate for 30 minutes or until a spreadable consistency.
Spoon ganache into a Multix Piping Bag and pipe onto cooled cupcakes. Finish with a scatter of sprinkles, to serve.