• In a small pot melt your butter. Once melted add your apples and cook for around 3 minutes until softened. Add your brown sugar and cinnamon and cook for another 2 minutes until caramelized. Stir in the cornstarch and cook until thickened about a minute. Take off of the heat and let cool until it’s room temperature. 
• On a floured surface, roll out your puff pastry dough and cut each sheet into four, for a total of eight squares. Add your apple mixture to each square around 1-2 tablespoons per square. 
• In a small bowl mix one egg and 1 tablespoon of water and brush over all the sides of the squares before folding. Once folded brush each side again and make divots around the edges with a fork.
• Add to a baking pan with parchment and bake at 350 for 25-30 minutes 

To Make The Glaze

• Combine the powdered sugar and milk together until combined and drizzle over the hot pastries 

To Make Ahead and Freeze

• Follow steps 1-3 then place the pan in the freezer to freeze. Once frozen, wrap each turnover with foil and keep until you’re ready bake. 
• Preheat oven to 350 and bake for 35-40 minutes