Creating Creamy Chicken Pillows with Parmesan Sauce is a breeze when you follow these simple steps:

1. Preheat Oven: Start by preheating your oven to 400°F (200°C). Line a baking sheet with parchment paper.
2. Prepare Filling: In a large bowl, combine the shredded chicken, cream cheese, mozzarella cheese, parsley, garlic powder, onion powder, salt, and pepper. Mix well until all ingredients are fully incorporated.
3. Roll Out Pastry: On a lightly floured surface, roll out the puff pastry sheets to about 1/8 inch thick.
4. Cut Pastry: Using a sharp knife or pizza cutter, cut the pastry into squares, approximately 4 inches by 4 inches.
5. Fill Pastry: Place a generous tablespoon of the chicken filling in the center of each pastry square.
6. Fold and Seal: Fold the pastry over the filling to create a triangle shape. Press the edges to seal, and use a fork to crimp the edges for extra security.
7. Egg Wash: Brush the tops of the pillows with the beaten egg for a golden finish.
8. Bake: Place the filled pastries on the prepared baking sheet and bake for 20-25 minutes or until golden brown and puffed.
9. Prepare Sauce: While the pillows are baking, melt the butter in a saucepan over medium heat. Add the heavy cream, Parmesan cheese, and Italian seasoning. Stir continuously until the sauce is smooth and slightly thickened.
10. Serve: Once the pillows are golden and baked through, remove them from the oven and let them cool slightly. Drizzle the creamy Parmesan sauce over the pillows just before serving.

These straightforward steps ensure that your Creamy Chicken Pillows with Parmesan Sauce come out perfectly every time!