This easy skillet recipe elevates classic chicken pot pie with a rich savory gravy, tender leftover chicken, plenty of veggies, and a golden flaky puff pastry topping. Chicken pot pie with puff pastry is a crowd-pleasing one pan dish that has all of the irresistibly cozy flavors you want in a comfort food dinner!
Preheat the oven to 400°F. Set out a 12-inch cast-iron skillet to use on the stovetop and place in the oven. If you don't have one, you can use a regular skillet and transfer the filling to a 9 x 9-inch baking dish.
Place the skillet on the stovetop. Add the butter, onions, celery, and garlic. Sauté the veggies over medium heat for 3-4 minutes. Add the flour, dried thyme, and dried sage to the vegetables. Season liberally with salt and pepper. Cook for another 2-3 minutes, stirring regularly.
Add the chicken broth, and stir well to create a gravy. Add in the frozen mixed vegetables, chopped chicken, and heavy cream. Stir until well combined. Then turn off the heat. Taste, and salt and pepper again if needed.
Lay the thawed puff pastry sheets on a clean work surface. If you plan to bake the pot pie in the cast-iron skillet, overlap the two puff pastry sheets in a star shape with eight points. Then roll the two sheets together making sure the center of the sheets is wide enough to cover the whole 12 inches of the skillet. *If transferring the chicken pot pie filling to a 9 x 9 inch baking dish, layer the two puff pastry sheets together in a perfect square and roll them together.
Carefully move the puff pastry sheet to the top of the skillet. Make sure the edges hang over a little bit, this helps keep the puff pastry sheet from sinking into the filling as it bakes.
In a small bowl, whisk together the egg and 1 tablespoon of water. Brush the egg wash over the surface of the puff pastry. Then use a small knife to cut steam vents in the top of the puff pastry.
Carefully place the skillet in the oven and bake for 30-35 minutes, until the puff pastry is fully puffed up and golden-brown, and the edges are bubbly. If the puff pastry starts to get too dark around any of the edges, loosely tent the top with foil and continue baking.
Allow the pot pie to rest for 5 minutes then cut and serve.
Notes
Storing Leftovers - Let leftover pot pie cool completely before transferring to an airtight container. Store in the refrigerator for up to 3 days.
Freezing - This dish freezes fabulously! If you plan to freeze and enjoy later, assemble the pie in a freezer-safe container that can go straight from the freezer into the oven (like a disposable aluminum pan), but do not bake. Wrap the whole thing tightly in plastic wrap, followed by a layer of foil. Freeze for up to 3 months. When ready to bake, remove the foil and plastic and bake from frozen, adding 15-20 minutes to the recipe cook time.
Reheating - Reheat leftovers in a microwave in short bursts at 50% power. You can also reheat leftovers in the oven to get the puff pastry crust nice and crispy again. About 15 minutes at 350 degrees should do it.