Preheat the oven according to package directions (typically 375°).
On a flat work surface, unroll crescent dough and gently separate the precut pieces. Brush melted butter on each piece of dough.
In a small bowl, beat (or whisk) the egg white until it is fluffy and soft.
Add crumbled feta and 1½ teaspoons All Purpose Greek Seasoning to the egg. Gently fold the mixture until it is well combined, breaking up any larger chunks of feta.
Place 1/8th of the feta mixture across the wide end of each piece of crescent dough. Gently roll each piece of dough, beginning at the wide end, sealing the feta mixture inside.
Place each roll on a large baking sheet approximately 2” apart, with the pointed end tucked under. Brush the rolls with more melted butter and if desired, sprinkle lightly with additional All Purpose Greek Seasoning.
Bake approximately 15 minutes, until the rolls are browned and the filling mixture is set.