Prepare the dough by mixing flour, salt, and sugar in a bowl.
Incorporate cubed cold butter into the flour mixture.
Add ice water gradually, mixing until dough forms.
Form the dough into a disc, wrap, and chill.
Prepare the apple filling while the dough chills.
Roll out the chilled dough into a rectangle.
Spread the apple filling over the rolled dough.
Roll the dough tightly from one long edge.
Transfer to a baking sheet and shape into a crescent.
Brush with egg wash and make slits in the top.
Bake until golden brown and flaky.
Allow to cool slightly before dusting with powdered sugar.