• Peel & remove core of the apples. Cut into ¼" cubes. Place butter in the saucepan. Turn up the heat to medium and wait until the butter is melted. Add cut apples, brown sugar, cornstarch, cinnamon, salt in the sauce pan and mix everything together. Cook for 5-7 minutes until the sauce has thickens. Remove pan from the heat source and let cool.
• Preheat the oven to 400°F. Place parchment paper on a baking sheet.
• Egg wash: In a small bowl: combine egg, water and whisk. Optional: strain the egg wash for a smooth finish.
• Place flour on a working surface (this will help prevent the puff sheets from sticking to the working surface). Unfold the puff sheet & use a rolling pin to remove any dents in the pastry. Use a pizza cutter or knife to cut out 4 equal squares. Repeat the other pastry. You should have 8 pastries total.
• Brush the egg wash on around the edges of the pastries. Place the cool apple filling in the center of each pastries (leaving ½" boarders around the edges). Bring the edges together. Use a fork and seal the dough edges together. Slice 2-3 slit to each pastry. Brush the egg wash on top. Sprinkle sugar on top of the pastry.
• Bake for 18-22 minutes or until golden. Remove from the oven and let rest for 15 minutes before serving.

Serve & Enjoy!