Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.

Combine the chopped Granny Smith apples with granulated sugar and cinnamon in a mixing bowl.

Roll out the thawed puff pastry on a floured surface and cut it into 5-inch squares.

Spoon a generous amount of apple mixture onto each pastry square, fold diagonally, and seal edges with a fork.

Brush the turnovers with melted butter and egg wash for a golden finish.

Bake for 20-25 minutes or until golden brown, filling your kitchen with a heavenly aroma.