Mary Berry's chicken casserole is a hearty, one-pot British comfort dish featuring bone-in chicken thighs, smoked bacon, chestnut mushrooms, and fresh herbs slow-cooked in a rich white wine and crème fraîche sauce. It delivers deep, savory flavor with a silky, creamy texture and takes about 1 hour 10 minutes from start to table.

Quick Answer: How Do You Make Mary Berry's Chicken Casserole?

Brown seasoned chicken thighs and smoked bacon separately, then build a sauce with onions, flour, chicken stock, and dry white wine. Add fresh thyme, sage, and bay leaves, then transfer to a 160°C (325°F) oven for 30 minutes. Stir in chestnut mushrooms and crème fraîche and cook for a further 15–20 minutes until tender.

Recipe Overview

Detail

Info

Prep Time

Less than 30 minutes

Cook Time

45–50 minutes

Total Time

~1 hour 10 minutes

Servings

4–6

Calories (per serving)

~548 kcal

Difficulty

Easy

Method

Stovetop + Oven

Storage

3 days (fridge), 3 months (freezer)

What Makes Mary Berry's Chicken Casserole Special?

Most chicken casseroles rely on heavy cream or canned soup. Mary Berry's version uses crème fraîche a tangy, thick cultured cream that adds richness without curdling under heat. Combined with dry white wine, smoked bacon, and a bundle of fresh herbs, the result is a deeply layered sauce that tastes far more complex than the ingredient list suggests.

The official BBC recipe (from Mary Berry's Love to Cook series) has earned a 4.3 out of 5 rating from over 115 reviews a testament to just how reliably it delivers.

What Ingredients Do You Need for Mary Berry's Chicken Casserole?

Chicken and Protein

• 8 bone-in, skinless chicken thighs
• 250g (9oz) dry-cured smoked bacon, snipped into small pieces

Why bone-in chicken thighs? Bone-in thighs release collagen during cooking, which thickens the sauce naturally and keeps the meat moist. Boneless thighs work, but you lose some depth of flavor.

Vegetables and Aromatics

• 2 large onions, finely chopped
• 200g (7oz) chestnut mushrooms, quartered
• Small bunch of fresh thyme (2 large sprigs)
• Small bunch of fresh sage (reserve 6 leaves for garnish)
• 2 bay leaves
• Small bunch of flatleaf parsley, chopped (to finish)

Sauce and Liquids

• 30g (1oz) plain flour
• 150ml (5fl oz) dry white wine (Sauvignon Blanc or Pinot Gris work well)
• 150ml (5fl oz) chicken stock
• 100g (3½oz) full-fat crème fraîche

Other

• 2 tbsp sunflower oil (plus extra if needed)
• Knob of unsalted butter (for frying sage leaves)
• Salt and freshly ground black pepper

What Equipment Do You Need?

• Large non-stick, ovenproof frying pan or flameproof casserole dish
• Slotted spoon
• Whisk (for incorporating stock into flour)
• Meat thermometer (optional but recommended)

Step-by-Step: How Do You Cook Mary Berry's Chicken Casserole in the Oven?

1. Brown the bacon. Place the bacon in a large ovenproof pan over medium heat and fry for a few minutes until it begins to render its fat. Add the onions and continue to fry until the bacon is golden at the edges. Remove with a slotted spoon and set aside.
2. Sear the chicken. Lightly season the chicken thighs with salt and pepper. Add the oil to the unwashed pan, then brown the chicken over high heat turning once until deeply golden on both sides. Set aside with the bacon and onions. Visual cue: You're looking for a deep amber color, not pale gold. This step builds the base flavor of the entire dish.
3. Preheat the oven to 160°C / 140°C Fan / Gas 3 (325°F).
4. Build the sauce. Scatter the flour into the pan (add a splash more oil if needed) and stir to form a paste. Gradually whisk in the chicken stock until smooth and beginning to thicken. Pour in the white wine and stir to combine.
5. Combine and braise. Return the bacon, onions, and chicken to the pan. Add the thyme, sage, and bay leaves. The sauce will be thick at this stage that's normal. Bring to a boil, season well, then cover and transfer to the oven for 30 minutes.
6. Add mushrooms and crème fraîche. Remove from the oven, stir in the mushrooms and crème fraîche, and return uncovered for a further 15–20 minutes, until the chicken is completely tender and the sauce is silky.
7. Finish and serve. Discard the bay leaves, thyme sprigs, and sage sprigs. Melt butter in a small pan and fry the reserved sage leaves until crisp these go on top. Stir in the chopped parsley and serve immediately.

Internal temperature check: Chicken is safe to eat at 75°C (165°F) when tested at the thickest part.

Mary Berry's Chicken Casserole with Vegetables: How Do You Boost the Veg?

The original recipe keeps vegetables minimal, but adding root vegetables can make it a more complete meal. Here's how to build a more complete meal: 

Vegetable

When to Add

Prep

Carrots

Step 5 (with onions)

Sliced into rounds

Celery

Step 5 (with onions)

Roughly chopped

Leeks

Step 5 (with onions)

Sliced into rings

Frozen peas

Last 5 minutes of cooking

Straight from frozen

Baby spinach

After removing from oven

Stir in to wilt

Can You Make Mary Berry's Chicken Casserole in a Slow Cooker?

Yes and this is a method most competitor recipes don't cover in detail. Here's how:

1. Complete steps 1–4 on the stovetop (browning and sauce-building are essential don't skip them).
2. Transfer everything to the slow cooker. Add the herbs.
3. Cook on LOW for 6–7 hours or HIGH for 3–4 hours.
4. Stir in the mushrooms and crème fraîche in the final 30 minutes of cooking.
5. Discard herbs, garnish, and serve.

Slow cooker tip: The sauce will be thinner than the oven version since liquid doesn't evaporate. If needed, remove the lid for the last 20 minutes on HIGH, or stir in a cornstarch slurry (1 tsp cornstarch dissolved in 2 tbsp cold water) at the end.

What Ingredient Substitutions Work in This Recipe?

Original Ingredient

Best Substitution

Notes

Crème fraîche

Full-fat sour cream or double cream

Sour cream adds slight tang; cream is richer

White wine

Extra chicken stock + 1 tsp lemon juice

Maintains acidity without alcohol

Plain flour

Cornstarch (use half the quantity)

Makes the dish gluten-free

Smoked bacon

Pancetta or unsmoked bacon

Unsmoked = milder flavor

Fresh sage

Dried sage (use ½ tsp)

Less aromatic but still effective

Chestnut mushrooms

White button mushrooms

Similar texture, milder flavor

Dietary Modifications

• Gluten-free: Swap plain flour for cornstarch or a gluten-free flour blend.
• Dairy-free: Use a full-fat coconut cream in place of crème fraîche. The flavor changes slightly but the texture holds well.
• Lower calorie: Use skinless boneless thighs and reduce the crème fraîche to 50g, replacing the rest with extra stock.

Mary Berry's Top Tips for Perfect Results

• Don't skip browning the chicken. This step creates fond (browned bits) on the pan, which is pure flavor. Pale seared chicken produces a pale, thin sauce.
• Use fresh herbs where possible. Fresh thyme and sage deliver a brightness that dried herbs can't replicate in a long braise.
• Make it a day ahead. The casserole actually improves overnight as the flavors deepen. Add the crème fraîche and mushrooms only when reheating.
• Crispy sage leaves are optional but worth it. Two minutes in butter transforms a simple garnish into a crunchy, fragrant finish that elevates the whole dish.

How Do You Store and Reheat Mary Berry's Chicken Casserole?

Method

Duration

Key Tip

Refrigerator

Up to 3 days

Reheat gently on the stovetop; add a splash of stock if the sauce thickens

Freezer

Up to 3 months

Freeze before adding crème fraîche and mushrooms

Reheating from frozen

Defrost overnight in the fridge; add cream and mushrooms once reheating

Why freeze without the cream? Creamy sauces can split or become grainy when frozen. Freezing without the crème fraîche and stirring it in during reheating guarantees a smooth, restaurant-quality sauce every time.

What Should You Serve with Mary Berry's Chicken Casserole?

Classic sides:

• Buttered new potatoes (Mary Berry's own recommendation)
• Creamy mashed potatoes
• Crusty white bread (for mopping up the sauce)
• Steamed green beans or tenderstem broccoli

Low-carb options:

• Cauliflower mash
• Celeriac mash
• Steamed leafy greens

Wine pairing: A dry, unoaked Chardonnay or a light Pinot Noir complements the creamy, herb-forward sauce without overpowering the delicate chicken flavor.

Nutrition Information (Per Serving, Based on 6 Servings)

Nutrient

Amount

Calories

548 kcal

Protein

43.4g

Carbohydrates

10.8g

Fat

34.3g

Saturated Fat

12.6g

Fibre

2.2g

Salt

1.78g

Nutritional data sourced from the BBC Good Food recipe page. Values are approximate and vary based on ingredient brands and portion sizes.

Troubleshooting: Common Problems and How to Fix Them

Problem

Likely Cause

Fix

Sauce is too thin

Insufficient flour or too much liquid

Stir in a cornstarch slurry; simmer uncovered

Sauce is too thick

Overcooking or too little liquid

Add a splash of chicken stock and stir

Chicken is dry

Overcooked or skinless breast used

Use bone-in thighs and check temp at 75°C

Crème fraîche split

Added to boiling liquid

Reduce heat first; add off the boil

Bitter flavor

Herbs overcooked

Remove herb sprigs before serving; use fresh herbs

Frequently Asked Questions

 How long does Mary Berry's chicken casserole take to cook?
The total cooking time is approximately 1 hour 10 minutes: less than 30 minutes of prep, 30 minutes covered in the oven at 160°C, and a further 15–20 minutes uncovered after adding the mushrooms and crème fraîche.

Can you use chicken breast instead of thighs in Mary Berry's casserole?
You can, but chicken breasts dry out faster than thighs during braising. If using breast, reduce the oven time to 20–25 minutes total and check that the internal temperature reaches 75°C (165°F). Bone-in thighs are strongly recommended for flavor and moisture.

Can Mary Berry's chicken casserole be made the day before?
Yes it's actually better the next day. Make the casserole up to 24 hours ahead, but add the crème fraîche and mushrooms only when reheating. Store covered in the refrigerator and reheat gently on the stovetop over low heat.

What wine should you use in Mary Berry's chicken casserole?
Use a dry white wine such as Sauvignon Blanc or Pinot Gris. Avoid sweet wines, which can make the sauce cloying. If you prefer not to cook with alcohol, substitute an equal amount of chicken stock and add a small squeeze of lemon juice for acidity.

Can Mary Berry's chicken casserole be frozen?
Yes, but freeze it before adding the crème fraîche and mushrooms. Cream-based sauces can split when frozen. Add both during reheating after the casserole has been defrosted overnight in the fridge and warmed through on the stovetop.

What is the oven temperature for Mary Berry's chicken casserole?
Cook at 160°C / 140°C Fan / Gas 3 (325°F). This low-and-slow temperature ensures the chicken stays tender and the sauce reduces without burning. Higher temperatures will toughen the meat and may cause the sauce to split.

How many calories are in a serving of Mary Berry's chicken casserole?
According to the BBC recipe, each serving contains approximately 548 kcal, along with 43.4g of protein and 34.3g of fat. Calorie counts vary depending on whether you use skin-on thighs, the amount of crème fraîche, and serving size.

Is Mary Berry's chicken casserole gluten-free?
The original recipe uses plain flour to thicken the sauce, so it is not gluten-free as written. To make it gluten-free, replace the 30g of plain flour with 15g of cornstarch (cornflour), which has twice the thickening power.

What vegetables can you add to Mary Berry's chicken casserole?
Carrots, leeks, and celery are the most common additions add them with the onions in the early stages. Frozen peas or baby spinach can be stirred in during the final few minutes of cooking for color and added nutrition.

How do you stop the crème fraîche from splitting in chicken casserole?
Remove the pan from the heat or reduce to a very low simmer before stirring in the crème fraîche. Adding it to violently boiling liquid breaks the emulsion. Full-fat crème fraîche is more stable than low-fat versions, which are more prone to splitting.