Oreo and Fudge Chocolate Slice with Maltesers (no bake)

Name: Oreo and Fudge Chocolate Slice with Maltesers (no bake)
Prep time: 5 min
Total time: 5 min
Cuisine: British
Ingredients: 150g (5¾ oz) Maltesers or Whoppers (with extra for decoration) - see note 1; 75g (2½ oz) fudge (chopped into small pieces); 150g (5¾ oz) Oreos (crushed); 75g (⅓ cup) butter; 2 tablespoons light or golden syrup; 200g chocolate (I used milk)