Chicken, leek and mushroom casserole

This chicken, leek, and mushroom casserole features tender chicken thighs simmered with crispy bacon in a creamy, flavorful sauce enriched with thyme and garlic. It's a comforting dish that's ideal for chilly evenings or special gatherings.

26 Dec 2025
Cook time 80 min
Prep time 30 min

Ingredients:

8 chicken thighs
1 tbsp olive oil
10 bacon strips
2 leeks
2 cups mushrooms
2 garlic cloves
2 tbsp all-purpose white wheat flour
1 cup chicken gravy
1 cup white wine
1 tbsp fresh thyme
1/2 cup heavy whipping cream
Chicken, leek and mushroom casserole

Chicken, leek, and mushroom casserole is a delightful comfort dish that combines tender chicken thighs, savory bacon, and a creamy sauce infused with thyme and garlic. Perfect for those cozy nights or special occasions, this recipe is sure to be a crowd-pleaser. Let's dive into a delicious journey of flavors and textures that will bring warmth and satisfaction to your table.

Instructions:

1. Preheat the Oven:
Preheat your oven to 180°C (350°F).
2. Prepare the Ingredients:
- Clean the chicken thighs and pat them dry with a paper towel.
- Cut the bacon strips into small pieces.
- Slice the leeks and mushrooms.
- Mince the garlic cloves.
- Chop the fresh thyme.
3. Sear the Chicken:
- Heat the olive oil in a large ovenproof skillet or casserole dish over medium-high heat.
- Add the chicken thighs, skin-side down, and cook for 5-7 minutes until the skin is golden brown. Flip and cook the other side for 3-4 minutes.
- Remove the chicken from the skillet and set it aside.
4. Cook the Bacon:
- In the same skillet, add the bacon pieces and cook until crispy, about 5-7 minutes.
- Remove the bacon and set it aside with the chicken thighs.
5. Sauté the Vegetables:
- In the same skillet, add the leeks and mushrooms. Sauté for 5-7 minutes until they start to soften.
- Add the minced garlic and cook for an additional 2 minutes, stirring frequently.
6. Make the Sauce:
- Sprinkle the flour over the vegetables and stir to coat evenly. Cook for 1-2 minutes.
- Gradually pour in the chicken gravy and white wine, stirring continuously to avoid lumps.
- Add the chopped fresh thyme and bring the mixture to a simmer.
7. Combine and Simmer:
- Return the chicken thighs and bacon to the skillet. Mix everything together.
- Pour in the heavy whipping cream and stir to combine.
- Bring the mixture back to a simmer, then cover the skillet with a lid or aluminum foil.
8. Bake:
- Transfer the skillet to the preheated oven and bake for 30-35 minutes, or until the chicken is cooked through and the sauce has thickened.
- If you prefer a thicker sauce, remove the lid/foil for the last 10 minutes of baking.
9. Serve:
- Remove the casserole from the oven and let it rest for a few minutes.
- Serve the chicken, leek, and mushroom casserole hot, with your choice of side dishes such as mashed potatoes, rice, or a fresh green salad.

You've now mastered the art of making a delicious chicken, leek, and mushroom casserole. With its rich, creamy sauce and the perfect blend of flavors, this dish will surely become a regular in your meal rotation. Serve it with a side of crusty bread or a fresh salad to complete your meal. Enjoy every savory bite!

Chicken, leek and mushroom casserole FAQ:

What is the recommended baking time for the casserole?

Bake the casserole in the preheated oven for 30-35 minutes. This ensures the chicken is cooked through and the sauce thickens adequately.

How do I know when the chicken is done cooking?

The chicken thighs should reach an internal temperature of 74°C (165°F) to ensure they are fully cooked. You can use a meat thermometer to check this.

Can I substitute the heavy whipping cream with a lighter option?

Yes, you can substitute the heavy whipping cream with half-and-half or whole milk, but this may result in a less rich sauce. For a dairy-free option, try using coconut milk or a plant-based cream.

What is the best way to store leftover casserole?

Store leftovers in an airtight container in the refrigerator for up to 3-4 days. To reheat, it’s best to use the oven for even heating, though the microwave can also be used.

Is there a recommended pan size for this recipe?

A large ovenproof skillet or casserole dish is ideal. A skillet that is at least 12 inches in diameter or a casserole dish that can hold around 3-4 quarts will work best.

Tips:

- Use bone-in, skin-on chicken thighs for maximum flavor and tenderness.

- Don't skip browning the chicken and bacon; it adds depth to the dish.

- Ensure the leeks are thoroughly cleaned as they can harbor dirt.

- For a thicker sauce, you can add an extra tablespoon of flour.

- If you prefer a non-alcoholic version, substitute the white wine with an additional cup of chicken gravy.

- Fresh thyme can be replaced with dried thyme; use 1 teaspoon instead.

- Allow the casserole to rest for a few minutes after cooking; this helps the flavors meld together.

Nutrition per serving

4 Servings
Calories 1030kcal
Protein 60g
Carbohydrates 30g
Fiber 3.61g
Sugar 7g
Fat 70g

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