Preheat oven to 350 degrees. Line 2 rimmed baking sheets with parchment paper. Set aside.
Place a heavy bottom pot filled 1/3 way with water over medium heat so water simmers. Add another pot on top to create a double boiler.
Into double boiler pot add: sugar, egg whites. Whisk for approx 10 minutes OR until it thickens and you have a glossy texture.
Transfer mixture to the bowl of your stand mixer. Mix on medium speed for approximately 7-8 minutes OR until it’s a nice silky consistency.
Fold in vanilla, flour and Toblerone.Using a small cookie scoop (or 1 tablespoon measuring spoon) Scoop out mixture onto parchment lined baking sheets leaving at least 2″ between each.
Bake for approximately 20 minutes. Remove from oven and transfer to a cooling rack. Careful not to drop them as they will crush easily.