Chicken and Leek Pie with Puff Pastry

Chicken and leek pie with puff pastry is a savory pie filled with tender chicken, softened leeks, and a creamy herb sauce beneath a crisp, golden lid. This practical version uses cooked chicken, so the filling can be prepared quickly and cooled before the pastry goes on.

Ingredients

1 sheet all-butter puff pastry, thawed if frozen, about 10 oz (280 g)
1 tbsp (15 ml) olive oil
2 tbsp (28 g) unsalted butter
2 medium leeks, white and pale green parts only, about 12 oz (340 g) before trimming
2 medium carrots, peeled and diced, about 1 cup (130 g)
2 garlic cloves, finely chopped, about 2 tsp (10 g)
⅓ cup (45 g) all-purpose flour
1½ cups (355 ml) chicken broth
¾ cup (180 ml) whole milk
½ tsp dried thyme, or 1 tsp (1 g) fresh thyme leaves
½ tsp fine salt, plus more to taste
¼ tsp black pepper, plus more to taste
3 cups (about 420 g) cooked chicken, cut into bite-size pieces
½ cup (60 g) frozen peas
1 large egg, beaten with 1 tsp (5 ml) water, for the pastry glaze

Instructions

Prepare the oven and dish. Heat the oven to 400°F (200°C). Set a rack in the center. Use a 9-inch (23 cm) deep pie dish or a similar 1½-quart (1.4-liter) baking dish. Thaw frozen pastry according to its package directions, keeping it chilled until needed.
Clean and cook the vegetables. Trim off the dark green leek tops and root ends. Slice the white and pale green parts into thin half-moons, then rinse thoroughly in a bowl of cold water, separating the layers so grit falls away. Lift the leeks out and drain. Heat the oil and butter in a large skillet over medium heat. Add the leeks and carrots and cook for 8–10 minutes, stirring often, until the leeks are soft and the carrots begin to tenderize. Stir in the garlic and thyme for 30 seconds.
Make the sauce. Sprinkle the flour over the vegetables and stir for 1 minute. Gradually pour in the broth while stirring to avoid lumps, then add the milk, salt, and pepper. Bring to a gentle simmer and cook for 3–5 minutes, stirring, until the sauce is smooth and thick enough to coat a spoon. Remove the skillet from the heat. Stir in the cooked chicken and peas. Taste and adjust the seasoning.
Cool the filling. Transfer the filling to a wide bowl or tray and let it cool for about 10 minutes, stirring once or twice. It should be warm rather than steaming hot before it is covered; hot filling can soften the pastry and make it bake unevenly. If preparing ahead, cool promptly and refrigerate rather than leaving it at room temperature for more than 2 hours.
Top with pastry. Spoon the filling into the pie dish. Unfold the pastry and lay it over the top. Trim excess, leaving about ½ inch (1 cm) overhang, then press the edge against the rim to seal. Cut a small slit in the center to release steam. Brush the pastry evenly with the beaten egg mixture. Place the dish on a baking sheet in case the filling bubbles over.
Bake and check the filling. Bake for 30–35 minutes, until the pastry is well risen and deep golden and the filling is bubbling at the edges. Check the center of the chicken filling with a food thermometer: USDA FSIS guidance says reheated leftovers must reach a safe minimum internal temperature of 165°F (74°C). If the pastry browns before the center is hot, loosely cover it with foil and continue baking. Rest the pie for 10 minutes before serving so the sauce settles.

Tips

Wash leeks carefully. Grit collects between their layers. Rinsing the sliced leeks in a bowl and lifting them out leaves the sediment behind more reliably than a quick rinse under the tap.
Keep the pastry cold. If it becomes soft or sticky while you assemble the pie, chill it for 10–15 minutes. Cold pastry is easier to handle and gives a better rise.
Avoid a runny filling. Simmer the sauce until thick before adding the chicken, and let the filling cool before topping. If using broth with a lot of salt, reduce the added salt and adjust after tasting.
Use cooked chicken safely. Leftover or rotisserie chicken works well. Refrigerate cooked chicken within 2 hours, and bring the pie’s center to 165°F (74°C) when reheating.

Serving Suggestions

Serve slices hot after the 10-minute rest, with a crisp green salad dressed with a simple vinaigrette or steamed green beans. For a heartier plate, add mashed potatoes or roasted root vegetables, though the pie already contains pastry and a creamy filling. A spoonful of whole-grain mustard on the side adds a sharp contrast without changing the pie itself.

Variations

For a lighter sauce, replace the whole milk with 2% milk; the filling will be a little less rich. A splash of cream can be used in place of part of the milk for a fuller texture, but the sauce should still be thick before baking. Swap the peas for chopped green beans or mushrooms; cook mushrooms with the leeks until their released liquid evaporates. For extra herbs, add 1 tbsp (4 g) chopped parsley after the filling leaves the heat. If all-butter pastry is unavailable, regular frozen puff pastry is a suitable substitute, though its flavor may be less buttery. To make individual pies, divide the filling among oven-safe ramekins and cut pastry lids to fit; start checking for browning after about 20 minutes, while confirming the filling reaches 165°F (74°C).

Storage and Reheating

Refrigerate leftover pie within 2 hours of baking, covered or in an airtight container. It keeps for 3–4 days in the refrigerator. Reheat portions in an oven at 350°F (175°C) until the center reaches 165°F (74°C), checking with a food thermometer; this usually takes 20–30 minutes, depending on portion size. Cover loosely with foil if the pastry is browning too quickly. A microwave also works, but the pastry will soften; heat in short intervals until the center reaches 165°F (74°C). For longer storage, freeze portions in freezer-safe containers for up to 2 months for best quality. Thaw overnight in the refrigerator and reheat to 165°F (74°C). Do not leave the pie at room temperature for more than 2 hours.

Frequently Asked Questions

Can I make chicken and leek pie ahead?
Yes. Make the filling up to 2 days ahead, cool it promptly, and refrigerate it covered. Add it to the dish and top with pastry shortly before baking. If the filling is cold, allow extra baking time and check the center reaches 165°F (74°C).

Can I use raw chicken?
For this recipe, cooked chicken keeps the filling method straightforward. If starting with raw chicken, cook it separately until its thickest pieces reach 165°F (74°C), measured with a food thermometer, before adding it to the sauce. Do not rely on the pie’s baking time alone to cook raw chicken evenly.

Why is my pastry soggy underneath?
A hot, watery filling can soften pastry before it has time to rise. Thicken the sauce fully, cool the filling until it is no longer steaming, and keep the pastry cold. Baking the dish on a preheated baking sheet can also help the base heat more promptly.

Can I assemble the whole pie in advance?
It is better to refrigerate the filling and pastry separately, then assemble just before baking. Assembled pastry can become damp as it sits against the filling. If you do assemble it ahead, cover and refrigerate, then bake within 24 hours and allow extra time if it goes into the oven cold.

Can I freeze the pie?
Yes. Freeze baked, cooled portions in airtight freezer-safe containers for up to 2 months for best quality. The pastry may lose some crispness after thawing. Thaw in the refrigerator and reheat until the center reaches 165°F (74°C); avoid refreezing leftovers that have already been reheated.

What can I use instead of leeks?
Use 1 large sweet onion, about 1½ cups (200 g) sliced, for a practical substitute. It will taste sharper and less delicate than leek, so cook it gently until soft before adding the flour. A small bunch of scallions can also work, though the flavor will be milder.

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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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