Preheat your oven to 350°F (175°C). Line a baking sheet with a silicone mat or lightly butter it.

In a medium bowl, whisk together the flour, sugar, and salt.

Add the egg whites, melted butter, and vanilla extract. Whisk until the batter is smooth and free of lumps.

Drop 1 tablespoon of batter onto the prepared baking sheet. Using the back of the spoon, spread it into a thin 3-inch circle. Repeat with one more tablespoon, leaving at least 4 inches between them.

Bake for 6-8 minutes, until the edges are golden brown and the center is lightly set.

Working quickly, use a thin metal spatula to lift one hot cookie. Place a fortune strip in the center, then fold the cookie in half to create a half-moon shape.

Hold the folded cookie over the edge of a bowl, and gently press the center down to create the classic curved shape. Hold for 10 seconds until set.

Place the finished cookie in a muffin tin to cool completely and hold its shape. Repeat with the remaining batter.