Chicken and Leek Pie in the Thermomix

Chicken and leek pie is a comforting British-style bake with tender chicken, mild leeks and a creamy sauce beneath crisp puff pastry. The Thermomix makes the filling straightforward to prepare, while baking the pastry separately from the filling helps keep the base and lid flaky rather than soggy.

Ingredients

1 sheet (about 10 oz / 280 g) ready-rolled all-butter puff pastry, thawed if frozen
1 lb 5 oz (600 g) boneless, skinless chicken thighs, cut into ¾-inch (2 cm) pieces
2 medium leeks (about 10 oz / 280 g trimmed), white and pale-green parts only, sliced and washed well
1 small yellow onion (about 5 oz / 140 g), peeled and quartered
1 medium carrot (about 3½ oz / 100 g), peeled and cut into chunks
1 garlic clove, peeled
1 oz (30 g) unsalted butter
1 tbsp (15 ml) olive oil
⅓ cup (40 g) all-purpose flour
1 cup (240 ml) chicken stock, preferably lower-sodium
½ cup (120 ml) whole milk
½ tsp dried thyme
½ tsp fine salt, plus more to taste
¼ tsp black pepper
1 tbsp (15 ml) cold water
1 large egg (about 50 g), beaten with 1 tsp (5 ml) water, for brushing

Instructions

Prepare the oven and pastry. Heat the oven to 400°F (200°C). Lightly grease a 9-inch (23 cm) pie dish. Unroll the pastry and keep it chilled while you make the filling. If it is larger than the dish, leave enough overhang to cover the rim; avoid stretching it.
Chop the vegetables in the Thermomix. Put the onion, carrot and garlic in the mixing bowl. Chop for 5 seconds on speed 5. Scrape down the bowl with the spatula. Add the butter and olive oil, then sauté for 5 minutes at 250°F (120°C), speed 1, with the measuring cup removed and the simmering basket placed on the lid to reduce splatter.
Cook the leeks. Add the sliced, thoroughly washed leeks and sauté for 4 minutes at 250°F (120°C), reverse speed 1. Keep the basket on the lid. Leeks can hold grit between their layers, so rinse them after slicing and drain well before adding.
Make the sauce. Add the flour and cook for 1 minute at 212°F (100°C), speed 1. Pour in the stock and milk; add the thyme, salt and pepper. Cook for 6 minutes at 212°F (100°C), speed 2, with the simmering basket on the lid. The sauce should thicken lightly; it will set further as the pie bakes.
Add and cook the chicken. Add the chicken pieces and cold water. Cook for 12 minutes at 212°F (100°C), reverse speed 1, using the simmering basket on the lid. Check several of the largest chicken pieces with a food thermometer: the USDA FSIS safe minimum for poultry is 165°F (74°C). If any pieces are below temperature, cook for another 2–3 minutes and check again. Transfer the filling to a heatproof bowl and let it cool for about 10 minutes so the pastry does not soften on contact.
Assemble the pie. Spoon the filling into the pie dish and spread it evenly. Lay the pastry over the top, trim excess and press the edges firmly onto the dish rim. Cut a small steam vent in the center. Brush the pastry with the beaten egg mixture, taking care not to let it run down the sides, which can stop the layers from rising.
Bake until golden. Bake for 25–30 minutes, until the pastry is puffed and deep golden and the filling is bubbling at the vent. If the pastry browns too quickly, loosely cover it with foil for the last few minutes. Rest the pie for 10 minutes before serving; the filling will be very hot and will thicken slightly as it stands.

Tips

Use the Thermomix reverse setting when cooking the chicken to stir the sauce without chopping the pieces. Cut the chicken into even pieces so it cooks consistently.
Wash leeks carefully after slicing. Any grit left between the layers can end up in the sauce, and excess water can make the filling thinner.
Let the filling cool briefly before covering it with pastry. A hot filling can melt the pastry’s butter layers before baking, leading to a less flaky top.
If you do not have a pie dish, use an ovenproof 9-inch (23 cm) skillet or baking dish. Check the Thermomix instructions for your model and do not exceed its bowl capacity.

Serving Suggestions

Serve the pie warm with steamed green beans, peas or broccoli to balance the creamy filling. Mashed potatoes are a hearty option, though they are not essential because the pastry already makes the meal substantial. A simple green salad with a sharp vinaigrette also works well. Spoon the filling and pastry onto plates rather than cutting immediately from the oven; the short rest helps portions hold their shape.

Variations

For a richer, more herb-forward filling, stir in ½ cup (75 g) frozen peas and 1 tbsp (4 g) chopped parsley after cooking the chicken. For a milder flavor, replace the thyme with ½ tsp dried tarragon. To use chicken breast instead of thighs, cut it into the same-sized pieces and check it carefully at the end of the cooking time, as lean breast can dry out if overcooked. For a meat-free version, replace the chicken with 12 oz (340 g) sliced mushrooms and use vegetable stock; sauté the mushrooms with the leeks until their released liquid has mostly evaporated. The texture will be more tender and earthy than the chicken version.

Storage and Reheating

Refrigerate leftover pie within 2 hours of baking, covered or in an airtight container, and eat within 3–4 days. For best pastry texture, reheat individual portions in a 350°F (175°C) oven for about 15–20 minutes, covering loosely with foil if the top is already browned; make sure the center reaches 165°F (74°C). A microwave is quicker but softens the pastry, so heat portions in short intervals and check the center temperature. Freeze cooled portions, well wrapped, for up to 2 months for best quality. Thaw overnight in the refrigerator and reheat until the center reaches 165°F (74°C).

Frequently Asked Questions

Can I make the filling ahead?
Yes. Prepare the filling, cool it promptly, and refrigerate it in a covered container for up to 2 days. Assemble the pie shortly before baking. If the chilled filling is very cold, allow a few extra minutes in the oven and confirm that it is hot throughout.

Can I use shortcrust pastry?
Yes. Shortcrust gives a sturdier, less flaky crust. Follow the package directions for covering a filled pie, and cut a small vent in the top so steam can escape.

Why is my pie filling runny?
The filling may need more time to thicken, or the leeks may have carried excess water into the bowl. Cook the sauce until lightly thickened before adding the pastry, and drain the washed leeks well. Resting the baked pie for 10 minutes also helps the sauce settle.

Can I make this without a Thermomix?
Yes. Chop the vegetables finely, sauté them in a pan with the butter and oil, stir in the flour, then gradually add the stock and milk. Simmer until thickened, add the chicken and cook gently until it reaches 165°F (74°C) at the thickest pieces. Assemble and bake as directed.

Can I bake the pie from frozen?
For best results, thaw a fully assembled, unbaked pie overnight in the refrigerator before baking. Baking from frozen can brown the pastry before the filling heats through. If baking from frozen, use a suitable ovenproof dish, cover the top loosely if needed and check that the center reaches 165°F (74°C).

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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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