Preheat the oven to 350 degrees.
Melt the butter in a large skillet over medium heat.
Whisk in the flour and continue whisking until it starts to bubble.
Slowly whisk in the milk.
Add the heavy cream and continue whisking until the mixture starts to bubble again.
Stir in the sugar, pepper, poultry seasoning, onion powder, garlic salt, and celery seed.
Remove from the heat. Add the cooked chicken, chopped potato, peas, and carrots.
Gently toss to combine.
Divide this mixture between 4 pie pans. (6-inches each)
Unroll the puff pastry, remove the parchment, and lightly roll it out on a flat surface.
Cut out circles slightly bigger than the top of your pie pans.
Place a puff pastry circle on top of each pot pie.
Whisk the egg in a small bowl with a splash of water.
Brush the egg wash over the top of the pot pies.
Place them on a baking sheet to catch any drips.
Bake for 20-30 minutes until the tops are golden brown and the filling is bubbly.