Roast Chicken and Leek Pie with Golden Puff Pastry

Roast chicken and leek pie combines tender cooked chicken and mellow leeks in a creamy, savory sauce, covered with crisp puff pastry. It is a practical way to turn leftover roast chicken into a satisfying British-style meal; serve it hot after the pastry has risen and browned.

Ingredients

2 tablespoons (28 g) unsalted butter
2 medium leeks (about 450 g total), white and light-green parts only
1 medium yellow onion (about 150 g), finely chopped
2 medium carrots (about 150 g), peeled and diced small
2 tablespoons (16 g) all-purpose flour
1 cup (240 ml) low-sodium chicken stock
¾ cup (180 ml) heavy cream
1 teaspoon (5 ml) Dijon mustard
½ teaspoon dried thyme, or 1 teaspoon (about 1 g) fresh thyme leaves
½ teaspoon fine salt, plus more to taste
¼ teaspoon freshly ground black pepper
3 cups (about 420 g) cooked roast chicken, skin and bones removed, cut into bite-size pieces
½ cup (75 g) frozen peas
1 sheet all-butter puff pastry, thawed according to its package directions (about 250 g)
1 large egg (about 50 g), beaten with 1 teaspoon (5 ml) water, for brushing

Instructions

Heat the oven to 400°F (200°C). Set a rack in the center. Trim the roots and dark-green tops from the leeks, halve them lengthwise, and rinse carefully between the layers to remove grit. Slice thinly, then drain well.
Melt the butter in a large skillet or saucepan over medium heat. Add the leeks, onion, and carrots. Cook for 8–10 minutes, stirring often, until softened but not deeply browned. If the pan begins to look dry or the vegetables start catching, lower the heat and add a tablespoon of water.
Sprinkle the flour over the vegetables and stir for 1 minute so it coats them evenly. Gradually pour in the stock while stirring to prevent lumps. Add the cream, mustard, thyme, salt, and pepper. Bring to a gentle simmer and cook for 3–5 minutes, stirring, until the sauce thickens enough to coat a spoon.
Remove the pan from the heat. Fold in the cooked chicken and peas. Taste and adjust the seasoning. Let the filling cool for about 10 minutes; putting very hot filling beneath pastry can soften it before it has a chance to puff. Transfer the mixture to a 9-inch (23-cm) deep pie dish or a similar 2-quart (1.9-L) baking dish, and spread it evenly.
Roll the thawed pastry on a lightly floured surface, if needed, so it is large enough to cover the dish with a small overhang. Lay it over the filling and press it against the rim. Trim excess pastry, then crimp or press the edge with a fork to seal. Cut a small cross or two short slits in the center to let steam escape.
Brush the top lightly with the egg wash, keeping it off the dish rim where it could glue the pastry to the sides. Set the dish on a baking sheet to catch any bubbling filling. Bake for 25–30 minutes, until the pastry is well risen and deeply golden and the filling is bubbling at the edges. Since the chicken is already cooked, this is a reheating pie; if checking the center with a food thermometer, USDA FSIS guidance is to reheat leftovers to 165°F (74°C).
Rest the pie for 10 minutes before serving. The filling will be very hot, and this brief rest helps it settle so portions are easier to serve.

Tips

Wash leeks thoroughly: grit often hides between their layers. Slicing them first and rinsing in a bowl of water makes it easier for grit to fall to the bottom; lift the leeks out rather than pouring the water through them.
Use chicken that is fully cooked and has been handled safely. Remove skin and bones before measuring. If you are roasting chicken specifically for this pie, cook the poultry to the USDA FSIS safe minimum internal temperature of 165°F (74°C), checked with a thermometer in the thickest part.
Keep the pastry cold and handle it briefly. If it becomes soft while you assemble the pie, refrigerate it for 10–15 minutes before baking; warm pastry is more likely to slump than puff.
For a lighter sauce, replace the heavy cream with whole milk, but mix 1 tablespoon (8 g) of flour with the milk before adding it. The filling will be less rich and may need an extra minute or two to thicken.

Serving Suggestions

Serve each portion with a crisp green salad dressed with a sharp vinaigrette to balance the creamy filling. Steamed green beans, broccoli, or cabbage also work well. If you want a more substantial plate, add mashed potatoes, though the pie itself already includes pastry and a rich sauce.

Variations

Stir in ½ cup (75 g) sliced mushrooms with the leeks and cook until their liquid has evaporated. For a sharper flavor, add ½ cup (50 g) grated mature cheddar to the sauce after removing it from the heat. You can also replace the peas with ½ cup (75 g) diced cooked celery or leave them out. For individual pies, divide the filling among six oven-safe ramekins and cut pastry rounds to fit; begin checking for doneness after about 18 minutes, since smaller pies bake faster.

Storage and Reheating

Refrigerate leftovers within 2 hours of baking, covered or in an airtight container. Keep for 3–4 days. To reheat a portion, cover loosely with foil and warm in a 350°F (175°C) oven until the center reaches 165°F (74°C), checking with a food thermometer; remove the foil for the last few minutes to help the pastry crisp. A microwave is quicker but will soften the pastry, so heat in short intervals and confirm the filling reaches 165°F (74°C). Avoid reheating the same portion repeatedly.

Freeze cooled pie or individual portions in freezer-safe, airtight packaging for up to 2 months for best quality. Thaw overnight in the refrigerator, then reheat to 165°F (74°C). The pastry may be less crisp after freezing and thawing. Do not leave the pie at room temperature for more than 2 hours.

Frequently Asked Questions

Can I use leftover roast chicken?
Yes. This recipe is designed for about 3 cups (420 g) of cooked, boneless chicken. Use leftovers that have been refrigerated promptly, and reheat the finished pie until the center reaches 165°F (74°C).

Can I make the filling ahead?
Yes. Prepare the filling up to 2 days ahead, cool it promptly, and refrigerate in a covered container. Assemble the pie shortly before baking. If the filling is cold, allow extra baking time and check that the center reaches 165°F (74°C); the pastry may brown before the filling is hot, so loosely cover it with foil if needed.

Can I use shortcrust pastry instead of puff pastry?
Yes. Shortcrust gives the pie a sturdier, more traditional pie crust, but it is less flaky and may need a different baking time. Follow the pastry package guidance and bake until the crust is fully cooked and the filling is bubbling.

Why is my pie filling runny?
The sauce may not have simmered long enough to thicken, or the vegetables may have released extra water. Simmer the sauce until it coats a spoon before adding the chicken. Let the baked pie rest for 10 minutes before cutting so the filling can settle.

Can I bake this pie from frozen?
It is more reliable to thaw it overnight in the refrigerator before reheating. Baking a fully frozen pie can brown the pastry before the center is hot. If baking from frozen, use an oven-safe dish, cover the pastry loosely if it browns too quickly, and verify that the center reaches 165°F (74°C).

Do I need to cook the chicken again in the filling?
No. The chicken is already roasted, so the filling only needs to be heated through in the oven. Avoid simmering the chicken in the sauce for a long time, which can make it dry and stringy.

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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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