Preheat the oven to 180°C (350°F) and line a baking tray with parchment paper.
In a bowl, whisk egg whites and sugar until slightly frothy.
Add melted butter, vanilla extract, and a little water; mix well.
Fold in flour to form a smooth batter.
Spoon small circles of batter onto the tray and spread thinly.
Bake for 6–8 minutes until edges turn golden.
Quickly place a fortune message in the center, fold in half, then bend over a cup edge to shape.
Let cookies cool and harden.
Melt chocolate and dip half of each cookie.
Add toppings like sprinkles or nuts and let the chocolate set.