Chicken and Leek Pie Using Leftover Chicken

Chicken and leek pie turns cooked leftover chicken into a creamy, savory filling beneath crisp golden pastry. Leeks bring a mild onion flavor, while a little mustard and thyme keep the sauce lively; it is a practical British-style comfort food that works well for a family dinner.

Ingredients

2 tablespoons (28 g) unsalted butter
2 medium leeks (about 300 g), white and light-green parts only, halved lengthwise, rinsed well, and thinly sliced
1 medium carrot (about 100 g), peeled and diced small
2 tablespoons (16 g) all-purpose flour
1 cup (240 ml) low-sodium chicken stock
½ cup (120 ml) whole milk
½ cup (120 ml) heavy cream
1 teaspoon Dijon mustard (5 g)
1 teaspoon fresh thyme leaves (about 1 g), or ½ teaspoon (0.5 g) dried thyme
½ teaspoon fine salt (3 g), plus more to taste
¼ teaspoon black pepper (0.5 g)
3 cups (420 g) cooked chicken, skin and bones removed, cut or shredded into bite-size pieces
1 sheet (about 14 oz/400 g) all-butter puff pastry, thawed according to its package directions but still cool
1 large egg (about 50 g), beaten with 1 teaspoon (5 ml) water, for the pastry wash

Instructions

Heat the oven to 400°F (200°C). Set a rack in the center. Choose a 9-inch (23 cm) deep pie dish or a similar 1½-quart (1.4 L) baking dish. If the cooked chicken has been refrigerated, keep it chilled while preparing the sauce.
Melt the butter in a wide skillet or saucepan over medium heat. Add the leeks and carrot and cook for 8–10 minutes, stirring often, until softened but not browned. If the pan looks dry or the leeks begin to catch, lower the heat and add a tablespoon of water.
Sprinkle the flour over the vegetables and stir for 1 minute to coat them. Gradually pour in the stock, stirring so no floury lumps remain. Add the milk, cream, mustard, thyme, salt, and pepper. Bring the sauce to a gentle simmer, then cook for 3–5 minutes, stirring, until thick enough to coat a spoon.
Take the pan off the heat and fold in the cooked chicken. Taste the filling and adjust the seasoning. Spread it in the pie dish and let it cool for 10 minutes so it is not piping hot when topped; this helps the pastry stay cold and rise. Avoid leaving cooked chicken or filling at room temperature for more than 2 hours in total.
Lay the pastry over the dish. Trim any overhang, leaving about ½ inch (1 cm), then press the edge against the rim to seal. Cut a small cross or two short slits in the center to let steam escape. Brush the top with the beaten egg. Put the dish on a baking sheet in case the filling bubbles over.
Bake for 25–30 minutes, until the pastry is puffed and deep golden and the filling is bubbling at the edges. Because the chicken is already cooked, reheating the filling thoroughly matters: check its center with a food thermometer and make sure it reaches the USDA FSIS safe minimum temperature for leftovers, 165°F (74°C). If the pastry browns before the filling is hot, loosely cover it with foil and continue baking.
Rest the pie for 10 minutes before serving; the filling will settle and be easier to spoon. Serve hot.

Tips

Clean leeks carefully: Soil often hides between their layers. Slice them first, swish the pieces in a bowl of cold water, lift them out, and drain well; avoid pouring the gritty water back over them.
Use safely stored chicken: Use cooked chicken that was refrigerated within 2 hours of cooking and has been kept cold for no more than 3–4 days. Do not use chicken that sat out longer, and do not taste it to decide whether it is safe.
Keep the pastry cool: If the topped pie must wait, chill it briefly rather than leaving it out. Warm pastry can turn greasy and is less likely to puff. Follow the pastry package directions for thawing.
Adjust the sauce before baking: If it seems too thick, stir in a splash of stock or milk; if it is thin, simmer it a little longer before adding the chicken. A watery filling can make the pastry soggy.

Serving Suggestions

Serve a generous slice with peas, green beans, or steamed cabbage to balance the creamy filling. A crisp green salad with a sharp vinaigrette also works well. Since the pie is rich and includes pastry, keep side dishes simple; mashed potatoes are an option if you want a more substantial meal, though they are not necessary.

Variations

For a lighter filling, replace the cream with an equal amount of milk; the sauce will be less rich and may need an extra minute or two to thicken. If you do not have leeks, use about 2 cups (300 g) sliced onion, cooking it until soft; the flavor will be sharper and more onion-forward. Swap thyme for 1 tablespoon (4 g) chopped parsley stirred in at the end, or add ½ cup (75 g) frozen peas with the chicken. For a crisp, less buttery top, use shortcrust pastry instead of puff pastry, following its package baking guidance.

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. For longer storage, freeze portions in airtight, freezer-safe containers for up to 2–3 months for best quality; thaw overnight in the refrigerator before reheating. Do not thaw it on the counter.

Reheat individual portions in a 350°F (175°C) oven until the center reaches 165°F (74°C) on a food thermometer, usually about 20–30 minutes from chilled, depending on portion size. Cover loosely with foil if the pastry is browning too quickly, removing it near the end to crisp the top. A microwave is quicker, but softens the pastry; heat in short bursts and check that the center reaches 165°F (74°C). Reheat only the portion you plan to eat.

Frequently Asked Questions

Can I use rotisserie chicken?
Yes. Remove and discard the skin and bones, then measure 3 cups (420 g) of meat. Keep the chicken refrigerated until you fold it into the sauce, and make sure the finished pie reaches 165°F (74°C) in the center.

Can I make the filling ahead?
Yes. Prepare the filling, cool it promptly, and refrigerate it in a covered container for up to 1 day. Keep it chilled at 40°F (4°C) or below, then assemble and bake. A cold filling may take longer to heat through, so use a thermometer rather than relying only on the pastry color.

Can I bake this pie from frozen?
For best results, freeze the filling separately and add fresh pastry after thawing the filling in the refrigerator. Baking a fully assembled frozen pie can leave the pastry overdone before the center is hot. If you do bake it frozen, use a suitable ovenproof dish, follow the pastry maker’s guidance, and check the filling reaches 165°F (74°C).

How do I stop the bottom of the pastry getting soggy?
This recipe uses pastry only on top, so there is no pastry base to turn soggy. The main risk is a watery filling: simmer the sauce until it coats a spoon and let the filling cool briefly before topping it.

Can I use raw chicken instead of cooked leftovers?
This recipe is designed for cooked chicken. Do not add raw chicken to the filling and assume it will cook safely under the pastry; prepare it separately first, checking that poultry reaches the USDA FSIS safe minimum internal temperature of 165°F (74°C), then proceed as directed.

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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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