In a large mixing bowl, whisk together the flour, salt, eggs, milk, and melted butter until the batter is smooth and free of lumps.
Heat a lightly greased nonstick skillet over medium heat. Pour approximately 1/4 cup of batter into the skillet, immediately tilting and swirling the pan to spread the batter into a thin, even layer.
Cook until the underside is lightly golden and the edges begin to lift, about 1–2 minutes. Carefully loosen the wrapper with a spatula, flip, and briefly cook the other side.
Transfer the cooked wrapper to a plate and repeat with the remaining batter. Let the wrappers cool slightly before filling.