I went to m&m world in London a while ago, and what do you do when you are there, well buy over priced chocolate in a building that smells are artificial chocolate (I am the only one that thinks that, not the same smell as a Hotel Chocolat) you also do not realise how much m&m things you can get
But you can get the colours that you want and they make a pretty cake.
I used my favourite chocolate cake in an 6” sandwich cake tin, with a chocolate buttercream. Then comes the fun of covering the whole thing in m&m’s
I hope you like it