Follow these simple steps to create your own apple strudel:

1. Preheat Your Oven:
   Start by preheating your oven to 375°F (190°C).
2. Prepare the Filling:
   In a large bowl, mix together the sliced apples, sugar, cinnamon, raisins, and vanilla extract until well combined. This will be the flavorful heart of your strudel.
3. Roll Out the Pastry:
   Roll out the thawed puff pastry on a floured surface to prevent sticking. Ensure it’s large enough to hold your filling comfortably.
4. Add the Filling:
   Spread the apple mixture down the center of the puff pastry, leaving enough space on the sides to fold over.
5. Fold and Seal:
   Carefully fold the sides of the pastry over the filling, ensuring it’s sealed well to prevent any leakage during baking.
6. Prepare for Baking:
   Transfer the strudel onto a baking sheet lined with parchment paper to avoid sticking.
7. Brush with Egg:
   Beat the egg (or use an egg substitute for a vegan option) and brush it over the pastry for a beautiful, golden crust.
8. Bake:
   Place the strudel in the preheated oven and bake for 25-30 minutes or until it turns golden brown.
9. Cool and Dust:
   Allow the strudel to cool slightly before dusting it with powdered sugar for a delightful finishing touch.