Melt the Toblerone chocolate in a microwave-safe bowl on 50% power in 30 second bursts until just melted. Set aside. If using a Thermomix: Grate the chocolate for 5 seconds, Speed 6. Melt for 3 minutes, 50 degrees, Speed 2 (or until melted). Set aside.
Beat the egg whites until firm peaks have formed. Set aside.If using a Thermomix: In a clean bowl, insert the Butterfly whisk and whip for 2-5 minutes, Speed 4 (with the MC removed) until firm peaks form. Stop mixing as soon the you have firm peaks.
Whip the cream in a separate bowl until stiff peaks form.If using a Thermomix: In a clean bowl, insert the Butterfly whisk and whip on Speed 3 until whipped.
Gently fold the egg whites through the whipped cream.
Very gently fold the melted Toblerone chocolate through with a rubber spatula. Don’t over-mix the ingredients.
Spoon into serving glasses or bowls and refrigerate until set (at least 4 hours).
Light and fluffy mousse - the key to light and fluffy mousse is to avoid over-mixing the ingredients. Use a rubber spatula to very gently fold the ingredients through. Don’t worry if the mixture is streaky or lumpy during each step – this is totally fine!
Storing - store mousse in the fridge and consume within 2 days. This recipe is not suitable for freezing.