Step 1

Preheat the oven to 400°F (204°C). Line a large baking sheet with parchment paper and set aside.

Step 2

In a large mixing bowl, combine the chopped apple, sugar, flour, and cinnamon and mix until well combined. Set the mixture aside for 15 to 20 minutes.

Step 3

Unroll both pieces of thawed puff pastry, use a rolling pin to roll each one out a little, then cut each one into four squares (you will have eight total pieces).

Step 4

Whisk together the egg white and water until frothy and set aside.

Step 5

Using a slotted spoon, spoon about 1/4 cup of the apple filling (leaving as much juice as possible in the bowl) into one corner of the puff pastry, leaving enough space to fold the dough over. Brush the egg wash on the two edges of the puff pastry that make the corner you put the apple filling in, fold it over, and crimp the edges with a fork.

Step 6

Brush the remaining egg wash on top of each turnover, then cut two to three slits in the top of each one.

Step 7

Bake for 17 to 20 minutes, or until lightly golden brown and cooked through. Remove from the oven and set aside to cool.

Step 8

In a small bowl, whisk together the powdered sugar, vanilla, and 1 tablespoon (15 ml) of milk. If needed, add 1/2 teaspoon of milk at a time until the glaze has reached your desired consistency.

Step 9

Evenly distribute the glaze between all of the turnovers.