Heat the tiny bit of cream in a saucepan (yes, it does look so little but trust me, this is correct!) and add the broken bits of milk chocolate. Using a whisk, once the chocolate has melted, take off the heat and, using a balloon whisk, mix quickly until you have a mixture that resembles a gorgeous, chocolatey putty.
Using a teaspoon and your fingers, break off a walnut size of milk chocolate 'putty', roll it in the palm of your hands into a ball. Push a toasted hazelnut into the centre and roll again, ensuring that the hazelnut is completely covered. Complete the process until you have 30 balls then chill in the fridge for about 40 minutes.
Hazelnut Coating
Melt the milk chocolate in a bowl over a saucepan of hot water (bain-marie). As soon as the chocolate has melted, take off the heat and leave to cool slightly. Meanwhile, crush the hazelnuts (and wafers, if using) in a food processor (or place them in a bag and bash them using a rolling pin) then place them in a round bowl.
Dip the cooled rocher balls into the chocolate and immediately roll them in the crushed hazelnuts.
Place the rocher chocolate nutty truffles on a baking sheet covered with baking paper and leave to set at room temperature for 1½ hours.
Heat the oven to 180°C and roast all the hazelnuts in the oven for 10 minutes. Set aside to cool. If you prefer, you could wipe off the skins using a tea towel.
Notes
These little rocher bites can keep for up to 5 days, kept in a cool place.