Line your baking tray with baking paper or foil
Chop fruit and nuts
Melt chocolate, I did this in a bowl over water but you could microwave
Melt the other chocolate
Stir to make sure no lumps
Pour the chocolate into the tray, I always use the darker of the 2 chocolates being used first
Pour the lighter chocolate over the previous layer and swirl to your content
Sprinkle chopped fruit and nuts all over. And put in the fridge to set.
In this guide I have used milk and white chocolate, I have previously used dark and milk and dark and white. They all work well, So you can choose your favourite combinations.