Chicken Bacon and Leek Pie with Flaky Puff Pastry

Chicken bacon and leek pie is a savory pie filled with tender chicken, smoky bacon, soft leeks and a creamy, thyme-scented sauce beneath crisp puff pastry. It makes a satisfying main course, and the filling can be prepared ahead so the pastry stays flaky rather than soggy.

Ingredients

1 tablespoon (15 ml) olive oil
6 ounces (170 g) bacon, diced
1 ½ pounds (680 g) boneless, skinless chicken thighs, cut into 1-inch (2.5 cm) pieces
2 medium leeks, white and pale green parts only, halved lengthwise, washed well and sliced (about 3 cups/270 g)
2 tablespoons (28 g) unsalted butter
⅓ cup (40 g) all-purpose flour
1 ½ cups (355 ml) chicken stock
½ cup (120 ml) whole milk
1 teaspoon (2 g) fresh thyme leaves, or ½ teaspoon (1 g) dried thyme
½ teaspoon (3 g) fine salt, plus more to taste
¼ teaspoon (1 g) black pepper
1 sheet frozen puff pastry, about 9 ounces (250 g), thawed according to package directions but kept cold
1 large egg (about 50 g), beaten with 1 tablespoon (15 ml) water, for the egg wash

Instructions

Heat the oven to 400°F (200°C). Set a rack in the middle. Pat the chicken dry and season it with the salt and pepper. Keep the pastry chilled until needed.
Heat the oil in a large, deep skillet or Dutch oven over medium heat. Add the bacon and cook for 5–7 minutes, stirring occasionally, until browned and its fat has rendered. Transfer the bacon to a plate with a slotted spoon, leaving about 1 tablespoon of fat in the pan. If there is very little, add a small drizzle of oil.
Add the chicken in a single layer, working in batches if necessary. Brown for about 3 minutes per side; it does not need to cook through yet. Transfer it to the plate with the bacon. Use a food thermometer to check that the chicken reaches 165°F (74°C) before serving; this is the USDA FSIS safe minimum temperature for poultry.
Add the leeks to the pan and cook for 5–7 minutes over medium-low heat, stirring often, until softened but not browned. If the pan is dry, add a tablespoon of water. Stir in the butter until melted, then sprinkle in the flour. Cook for 1 minute, stirring to coat the leeks and remove the raw flour taste.
Gradually whisk in the chicken stock, scraping up any browned bits, then add the milk and thyme. Bring the mixture to a gentle simmer and cook for 3–5 minutes, stirring, until thick enough to coat a spoon. Return the chicken and bacon and any accumulated juices to the pan. Simmer for 2–3 minutes, then remove from the heat. Taste and adjust the seasoning. The filling should be thick, not soupy; if it looks loose, simmer it for another minute or two.
Transfer the filling to a 9-inch (23 cm) deep pie dish and let it cool for 10 minutes. This brief cooling helps keep the pastry from melting before it bakes. Lay the cold puff pastry over the dish, trim excess pastry if needed, and press the edges onto the rim. Cut a small slit in the center to release steam. Brush the top with egg wash, taking care not to let it pool along the edges.
Place the pie on a baking sheet to catch drips. Bake for 25–30 minutes, until the pastry is puffed and deeply golden and the filling is bubbling at the vent. If the pastry browns too quickly, loosely cover it with foil for the final few minutes.
Rest the pie for 10 minutes before serving. Check a piece of chicken in the center with a food thermometer; it must register 165°F (74°C). If it has not, return the pie to the oven and check again after a few minutes. The resting time lets the sauce settle for easier serving.

Tips

Leeks can trap grit between their layers. Slice them first, rinse thoroughly in a bowl of cold water, and lift them out rather than pouring the water and grit back over them.
Keep puff pastry cold and handle it as little as possible. Warm pastry becomes difficult to work with and may bake up less crisp; if it softens while you assemble the pie, chill it briefly.
For a thicker filling, simmer it before adding it to the dish. Avoid adding extra stock to loosen it: excess liquid can make the pastry soggy and the sauce runny.
For easier timing, make the filling ahead, cool it promptly, and refrigerate it. Assemble with cold filling and pastry shortly before baking; a cold pie may need a few extra minutes in the oven.

Serving Suggestions

Serve the pie warm with a simple green salad dressed with vinaigrette, or with steamed green beans, peas or roasted carrots. Mashed potatoes are a hearty option, though the pie is already rich and filling. A spoonful of mustard on the side adds a sharp contrast to the creamy sauce and smoky bacon.

Variations

For a lighter flavor, replace the bacon with 4 ounces (115 g) of sliced mushrooms, browned in a little oil; the pie will be less smoky and contain no bacon. You can also add 1 cup (150 g) of frozen peas to the filling just before it goes into the dish. Stir in ½ cup (50 g) of grated sharp cheddar for a more pronounced cheesy flavor, or use ½ teaspoon (1 g) dried sage in place of the thyme.

If puff pastry is unavailable, use a sheet of rolled shortcrust pastry and follow its package baking guidance; the top will be more tender and less flaky. For a dish without a pastry top, spoon the filling into a baking dish and cover it with mashed potato, then bake until the top is browned and the center reaches 165°F (74°C).

Storage and Reheating

Refrigerate leftovers within 2 hours of baking, covered, for 3–4 days. Cool the pie enough to handle before storing, and use a shallow airtight container for individual portions. For longer storage, freeze cooled portions in airtight, freezer-safe containers for up to 2–3 months; thaw overnight in the refrigerator for the most even reheating.

Reheat portions in an oven at 350°F (175°C), covered loosely with foil if the pastry is browning, until the center reaches 165°F (74°C) on a food thermometer. This usually takes 20–30 minutes from refrigerated, depending on portion size. A microwave is quicker but softens the pastry; heat in short intervals and check that the center reaches 165°F (74°C). Avoid reheating the same portion repeatedly.

Frequently Asked Questions

Can I make the filling ahead?
Yes. Cook the filling, cool it promptly, and refrigerate it in a covered container for up to 2 days. Put it in the pie dish and top with cold pastry shortly before baking. If the filling is very cold, expect the pie to take a little longer; check the chicken in the center for 165°F (74°C).

Can I use chicken breast instead of thighs?
Yes. Use the same weight of boneless, skinless breast and cut it into similar-sized pieces. Breast meat is leaner and can dry out more readily, so avoid over-browning it and confirm that it reaches 165°F (74°C) without cooking it much beyond that point.

How do I stop the bottom or filling from making the pastry soggy?
Keep the filling thick and let it cool for about 10 minutes before adding the pastry. Make a vent in the top so steam can escape, and bake the pie on a preheated oven rack rather than placing it on a cold surface. A hot baking sheet underneath can also help the bottom heat evenly.

Can I freeze the pie before baking?
It is best to freeze the filling separately and add fresh, thawed pastry when ready to bake. A fully assembled unbaked pie can be frozen, but puff pastry may not rise as evenly. If baking from frozen, do not thaw it at room temperature; bake until thoroughly hot and verify the chicken reaches 165°F (74°C).

What can I use instead of leeks?
Use about 2 cups (300 g) sliced yellow onion or 3 cups (300 g) sliced scallions in place of the leeks. Onion gives a sweeter, more familiar flavor, while scallions taste sharper and more delicate. Cook either substitute until softened before adding the flour.

Can I assemble the pie the day before?
You can assemble it, cover it and refrigerate it overnight, but pastry may absorb moisture from the filling and rise less. For the crispest top, store the cooled filling separately and assemble just before baking. Never leave the assembled pie at room temperature for more than 2 hours.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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