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Creamy Chicken Breast, Leek and Mushroom Lasagne

Creamy Chicken Breast, Leek and Mushroom Lasagne

with Wholegrain Mustard Sauce
Recipe Development Team
Recipe Development TeamUpdated on March 27, 2026
Calories
813 kcal
Protein
54.9g protein
Total
50 minutes
Difficulty
Medium
Allergens:
  • Mustard
  • Milk
  • Egg
  • Cereals containing gluten
  • Wheat
Produced in a facility that processes eggs, milk, fish, peanuts, sesame, shellfish, soy, tree nuts, and wheat.
serving amount

2 unit(s)

British Chicken Breasts

1 unit(s)

Garlic Clove

1 unit(s)

Leek

80 grams

Sliced Mushrooms

10 grams

Chicken Stock Paste

10 grams

Wholegrain Mustard

(Contains: Mustard)

150 grams

Creme Fraiche

(Contains: Milk)

40 grams

Grated Hard Italian Style Cheese

(Contains: Milk, Egg)

1 pack(s)

Lasagne Sheets

(Contains: Cereals containing gluten, Wheat)

Not included in your delivery

25 grams

Butter

2 tbsp

Plain Flour

300 milliliter(s)

Water for the Sauce

Energy (kJ)3404 kJ
Energy (kcal)813 kcal
Fat47.7 g
of which saturates26 g
Carbohydrate52.6 g
of which sugars8.5 g
Dietary Fibre5.4 g
Protein54.9 g
Salt2.2 g
Always refer to the product label for the most accurate ingredient and allergen information.
Baking Tray
Garlic Press
Pan
Oven dish

Instructions

Get Started
1

Preheat your oven to 220°C/200°C fan/gas mark 7.

Lay the chicken breasts on a baking tray. Drizzle with oil and season with salt and pepper. TIP: Notice a stronger smell from your chicken? Don’t worry, this is normal due to packaging we use to keep it fresh.

When the oven is hot, roast on the top shelf until browned and cooked through, 25-30 mins. IMPORTANT: Wash your hands and equipment after handling raw chicken and its packaging. It's cooked when no longer pink in the middle.

Once the chicken is cooked, set aside for later.

Prep Time
2

While the chicken is roasting, peel and grate the garlic (or use a garlic press). 

Trim the root and dark green leafy part from the leek and discard. Halve lengthways, then thinly slice.

Roughly chop the mushrooms.

Make your Roux
3

Heat a drizzle of oil in a large frying pan on medium-high heat.

Once hot, add the mushrooms and leek and season with salt and pepper.

Cook until the mushrooms have browned and the leek has softened, 6-7 mins, stirring occasionally.

Once softened, add the garlic and fry until fragrant, 1 min more.

Lower the heat to medium and melt in the butter (see pantry for amount). Stir in the flour (see pantry for amount). Cook, stirring, until it forms a paste, 1-2 mins - you've made a roux!

Start the Sauce
4

Gradually stir the water for the sauce (see pantry for amount), chicken stock paste and wholegrain mustard into the roux.

Bring to the boil, then lower the heat and simmer until thickened, 4-5 mins.

Meanwhile, once the chicken is cooked, use 2 forks to gently pull it apart and shred into small pieces.

When the sauce has thickened, stir in the creme fraiche, shredded chicken and half the hard Italian style cheese. Mix until completely coated. Season with salt and pepper and remove from the heat.

Add a splash more water if the sauce looks a little thick.

Into the Oven
5

In an appropriately sized ovenproof dish, spread a quarter of the creamy chicken mixture in a thin layer. Cover with a third of the lasagna sheets in an even layer. 

Repeat until you have 3 layers of sauce and 3 layers of lasagne sheets, then drizzle over the remaining sauce all over the top. You should have 3 layers of lasagna sheets and 4 layers of sauce.

Sprinkle over the remaining cheese.

Add to the middle shelf of the oven and bake until golden and bubbling, 25-35 mins.

Serve Up
6

When ready, halve the creamy lasagne and share between serving bowls.

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