Mary Berry Slow Cooker Chicken Casserole Recipe

The slow cooker chicken casserole is the weeknight dinner that requires almost nothing from you. Ten minutes of preparation in the morning — browning the chicken, softening the vegetables, pouring in the stock — and eight hours later you open the lid to something that smells extraordinary and tastes like it has been tended all day.

Mary Berry’s slow cooker chicken casserole recipe takes the principles of her classic chicken casserole and adapts them specifically for the slow cooker — a slightly thicker sauce to account for the liquid that does not evaporate during low, covered cooking, and a longer time at lower heat that produces chicken so tender it falls from the bone and vegetables so soft they meld into the rich, deeply flavoured sauce around them.

This is the recipe I set going before the school run and forget about until dinner. It is one of the genuinely useful recipes in a busy kitchen.

Slow Cooker Versus Oven — What Changes

The slow cooker produces a slightly different result from a casserole cooked in the oven — both are excellent but they are different.

The sauce is slightly more liquid. Because the slow cooker lid traps all steam, no liquid evaporates during cooking. This means the sauce needs to be slightly thicker at the start — more flour, slightly less stock — or it will be watery by the time you serve it.

The chicken becomes extraordinarily tender. Eight hours at a low temperature breaks down the collagen in the chicken thighs to produce a texture that is softer and more yielding than oven-braised chicken. The meat essentially falls from the bone at the touch of a fork.

The vegetables become very soft. Root vegetables cooked for eight hours become completely tender, absorbing the flavour of the stock around them. This is wonderful in a casserole — but if you prefer vegetables with more bite, add them in the final two hours rather than from the start.

Ingredients for Mary Berry Slow Cooker Chicken Casserole

• 8 chicken thighs, skin on, bone in
• 2 tbsp plain flour, seasoned with salt and pepper
• 2 tbsp sunflower oil
• 1 large onion, roughly chopped
• 3 carrots, peeled and cut into chunks
• 2 parsnips, peeled and cut into chunks
• 3 celery sticks, roughly chopped
• 3 garlic cloves, crushed
• 2 tbsp tomato purée
• 2 tbsp plain flour (for thickening)
• 500ml good quality chicken stock
• 150ml dry white wine (or extra stock)
• 2 tsp fresh thyme leaves (or 1 tsp dried)
• 2 bay leaves
• 1 tbsp Worcestershire sauce
• 200g baby button mushrooms, halved
• 2 tbsp fresh flat-leaf parsley, chopped
• Salt and freshly ground black pepper

How to Make Mary Berry Slow Cooker Chicken Casserole — Step by Step

Step 1 — Brown the Chicken

Dust the chicken thighs in the seasoned flour. Heat the sunflower oil in a large frying pan over a medium-high heat. Brown the chicken in batches — skin-side down first — for 3 to 4 minutes per side until deeply golden. Transfer to the slow cooker.

Do not skip this step. Browning adds colour and flavour that eight hours of slow cooking cannot replicate. The fond left in the pan is pure flavour.

Step 2 — Soften the Vegetables

In the same frying pan, reduce the heat to medium. Add the onion, carrots, parsnips, and celery. Cook for 5 to 6 minutes until beginning to soften. Add the garlic and cook for one more minute. Add the tomato purée and stir for one minute. Sprinkle over the two tablespoons of flour and stir for one more minute to cook the flour through.

Step 3 — Build the Sauce

Pour in the white wine and let it bubble briefly, scraping up the browned bits from the base of the pan. Add the chicken stock, thyme, bay leaves, and Worcestershire sauce. Stir well and bring briefly to the boil.

Pour the sauce and vegetables over the chicken in the slow cooker.

Step 4 — Slow Cook

Cover and cook on LOW for 7 to 8 hours or HIGH for 4 to 5 hours. The chicken should be completely tender and falling from the bone by the end of cooking.

In the final 30 minutes of cooking, add the halved mushrooms. Replace the lid and continue cooking.

Step 5 — Finish and Serve

Remove the bay leaves. Taste and season generously with salt and pepper. Scatter with fresh parsley.

Serve with creamy mashed potato, crusty bread, or rice to absorb the rich sauce.

My Top Tips For Mary Berry Slow Cooker Chicken Casserole

Always brown the chicken first. I know the whole point of a slow cooker is convenience, and browning adds a step. But pale, unbrowned chicken in a slow cooker produces a grey, flat result. Ten minutes of browning makes a fundamental difference to the colour and flavour of the finished casserole.

Use more flour than a standard casserole. The slow cooker traps all steam, so no liquid evaporates. Using two tablespoons of flour in the sauce base rather than one gives a properly thickened sauce by the time you serve it.

Add mushrooms in the final 30 minutes. Mushrooms added at the start of an eight-hour slow cook become completely dissolved into the sauce — which is not unpleasant, but you lose all texture. Added in the final 30 minutes, they remain identifiable and pleasantly soft.

Cook on LOW rather than HIGH. LOW for 7 to 8 hours gives a more tender, more evenly cooked result than HIGH for 4 to 5 hours. The lower, gentler temperature is more forgiving and gives a noticeably better texture to both the chicken and the vegetables.

Make it the night before. Slow cooker casseroles improve overnight. Cool completely, refrigerate, and reheat gently the next day — the flavour deepens significantly and the sauce becomes even more unctuous.

Serving Suggestions

With creamy mashed potato — the sauce seeps into the mash in the most wonderful way. With crusty bread for mopping up every last drop of sauce. With steamed greens alongside for freshness and colour.

How to Store Mary Berry Slow Cooker Chicken Casserole

In the fridge: Store in an airtight container for up to 3 days. Reheat gently on the hob or in the microwave until piping hot throughout.

In the freezer: Freeze in portions for up to 3 months. Defrost overnight in the fridge and reheat gently, adding a splash of stock if the sauce has thickened too much.

Mary Berry Slow Cooker Chicken Casserole Recipe

Mary Berry's slow cooker chicken casserole is rich, tender, and completely hands-off — set it in the morning and eat it that evening

Print Recipe Pin Recipe

Prep Time 20 minutes mins

Cook Time 5 hours hrs

Total Time 5 hours hrs 20 minutes mins

Servings: 6 Portions

Course: Main Course

Cuisine: British

Calories: 390

Ingredients Method Notes

Ingredients

  

• 8 chicken thighs skin on, bone in
• 2 tbsp plain flour seasoned
• 2 tbsp sunflower oil
• 1 large onion roughly chopped
• 3 carrots in chunks
• 2 parsnips in chunks
• 3 celery sticks roughly chopped
• 3 garlic cloves crushed
• 2 tbsp tomato purée
• 2 tbsp plain flour
• 500 ml chicken stock
• 150 ml dry white wine or extra stock
• 2 tsp fresh thyme leaves
• 2 bay leaves
• 1 tbsp Worcestershire sauce
• 200 g baby button mushrooms halved
• 2 tbsp fresh parsley chopped
• Salt and pepper

CHECK THIS RECIPE  Mary Berry Thai Chicken Curry Recipe

Method

 

1. Dust chicken in seasoned flour. Brown in batches in hot oil — skin-side down first — 3–4 minutes per side until deeply golden. Transfer to slow cooker.
2. In same pan, cook onion, carrots, parsnips, and celery 5–6 minutes. Add garlic — 1 minute. Add tomato purée — 1 minute. Sprinkle over flour — stir 1 minute.
3. Add wine — bubble briefly, scraping the base. Add stock, thyme, bay leaves, and Worcestershire sauce. Bring briefly to the boil. Pour over chicken in slow cooker.
4. Cover. Cook on LOW 7–8 hours or HIGH 4–5 hours.
5. Add mushrooms in the final 30 minutes. Replace lid.
6. Remove bay leaves. Season. Scatter parsley. Serve with mashed potato or crusty bread.

Notes

Always brown the chicken first — pale chicken gives a flat, grey result.

Use 2 tablespoons of flour in the sauce — the slow cooker traps all liquid.

Cook on LOW for the most tender result.

Add mushrooms in the final 30 minutes only — they dissolve if added at the start.

Improves significantly overnight — make ahead if possible.

Stores in the fridge for up to 3 days. Freezes for up to 3 months.

Frequently Asked Questions

Can I put everything in the slow cooker without browning anything first?

You can — the result will still be edible. But without browning the chicken and softening the vegetables first, the finished casserole will be paler, less flavourful, and the sauce will be noticeably thinner and less complex. The browning step is ten minutes well spent.

Can I use chicken breast instead of thighs?

Thighs are significantly better for slow cooking — they have more fat and collagen and become tender rather than dry and stringy over a long cook. If you must use breast, add it in the final two to three hours of cooking only.

Can I cook this on HIGH to save time?

Yes — HIGH for 4 to 5 hours gives a perfectly good result. The LOW setting gives a slightly more tender, more evenly cooked result. Choose based on your time available.

Why is my sauce too thin?

The flour was not cooked properly before the liquid was added, or not enough flour was used. Mix one tablespoon of cornflour with two tablespoons of cold water, stir into the hot casserole, replace the lid, and cook on HIGH for 20 minutes until thickened.

Can I add dumplings to slow cooker casserole?

Yes — place small suet dumplings on top of the casserole in the final hour of cooking on HIGH. They steam beautifully in the covered slow cooker and make the casserole a complete, substantial meal.

Can I prep everything the night before?

Yes — brown the chicken and prepare the sauce the night before. Refrigerate everything separately. In the morning, add everything to the slow cooker and set it going.