• Preheat oven to 425 degrees Fahrenheit (220 degrees Celsius).

Make the filling:

• Melt the butter and oil in a large skillet over medium heat. Add the diced cooked chicken along with the dehydrated onion, garlic powder, salt, pepper, thyme, sage, and poultry seasoning to the skillet. Stir well to combine.
• Add the all-purpose flour to the skillet. Stir the flour into the ingredients in the skillet and cook for 1-2 minutes before adding the chicken broth and heavy cream to the skillet. Once the liquids are added, stir continually over medium heat until the sauce thickens. Stir in the vegetables to combine, remove from the heat, and set the filling aside while preparing the puff pastry.

Preparing the puff pastry:

• In a small bowl, whisk together the egg and water to make the egg wash "glue" and "glaze."
• Working with one sheet of puff pastry at a time, roll each sheet into a large, evenly shaped square onto a lightly floured surface. Cut each large square into 4, evenly sized, smaller squares.
• Use a pastry brush to apply the egg wash "glue" onto the edges of each small square.
• Add approximately 1½ tablespoons of chicken pot pie filling to one corner of each puff pastry turnover square and fold the opposite end of the puff pastry square over the filling. Firmly press the two egg washed sides of the pastry square together to close and form a triangle.
• Continue this process with the second sheet of puff pastry and pot pie filling until 8 turnovers are formed. Place each turnover onto a parchment lined baking sheet leaving space between each turnover.
• Use a paring knife to pierce a steam hole on the top of each triangle turnover, and then use the tines of a fork to gently press the two cut sides of each turnover to fully seal so the turnovers stay closed in the oven.
• Finally, before baking, use a pastry brush to gently brush egg wash evenly over the top and edges of each turnover and top each turnover with a touch of Parmesan cheese, if desired.

Baking the chicken pot pie turnovers:

• Bake the turnovers in the preheated 425 degree oven for 18-20 minutes, or until the turnovers are puffed and beautifully golden brown. Cool slightly, and enjoy!