
Place the egg whites and brown sugar into a glass bowl and stir to combine.
Bring a saucepan with 2-3 inches of water to a simmer. Place the bowl with the egg and sugar on top of the saucepan. It is important that the water is not touching the bowl.
Stirring often, dissolve the brown sugar into the egg whites. This should take about 3 minutes. Test to see if the brown sugar is dissolved by dipping a finger into the egg whites and rubbing it between two fingers. You should not feel any sugar.
Remove the bowl from the saucepan and transfer the egg whites into the bowl of the stand mixer. Add the vanilla, cinnamon, and salt. Mix on low for 1 minute. Then increase the speed to medium until stiff peaks form. About 3-4 minutes.
Top your cake immediately and option to torch with a hand torch.