Start with cold yogurt. Add Greek yogurt to a mixing bowl. Cold yogurt helps the mousse set quickly and taste extra refreshing.
Add dry ingredients. Sprinkle in the chocolate protein powder and cocoa powder.
Add a small pinch of salt if using.
Mix until silky. Stir with a spatula or whisk until completely smooth. If it’s very thick, add 1 tablespoon of milk or water at a time. Aim for a thick, mousse-like texture that holds soft peaks.
Taste and adjust. If you want it sweeter, add a little sweetener and mix again.
This is also the moment to add vanilla or espresso if you like.
Rest briefly. Let the mousse sit for 5–10 minutes in the fridge. The cocoa hydrates and the texture becomes even creamier.
Serve and top. Spoon into a glass or bowl. Add berries, shaved chocolate, or a sprinkle of cocoa if you want a polished finish.