Once the dough has chilled in the refrigerator for about 2 hours, it will be firm yet pliable. Cold dough is the best to work with because it stays together well!
Sprinkle a clean work-surface with a little bit of flour, and roll the cold dough out to approximately 1/8th” thickness. Divide the dough into 4x4” squares.
Take each square one at a time and roll it out just a little bit bigger, lightly flouring both sides to prevent sticking or tearing. Place the apple filling in the center of the square of dough (I find that spreading the apple filling in a slight T-shape helps fill the natural shape of the turnover).Fill the turnovers with as much filling as you can without tearing the dough. Fold the dough over into a turnover shape. Crimp the edges with a fork.
Place the unbaked turnovers on a baking sheet lined with parchment paper or silicone baking mat. Bake at 400 degrees Fahrenheit for 15 minutes. (If you wish to add an egg wash and granulated sugar, do this before baking)
Let cool, sprinkle with cinnamon, and enjoy by themselves or with butter :)