Slow Cooker Chicken Casserole (Easy Dump‑and‑Go)

Slow Cooker Chicken Casserole

This Slow Cooker Chicken Casserole is the ultimate dump‑and‑go dinner — no browning, no faff, just simple ingredients that cook down into a thick, rich gravy all by themselves. It’s cosy, comforting, and one of the easiest slow cooker meals you’ll ever make.

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Post updated for 2026

This recipe is also a brilliant way to use up vegetables you already have — the ones sitting in the fridge that need a home. If you don’t like mushrooms, add another carrot. No leeks? Use extra onion or celery. It’s flexible, forgiving, and perfect for busy days.

You might also like my Slow Cooker Chicken Casserole using Campbell's Soup 😋

Why This Recipe Works

• No browning needed — everything cooks beautifully without the extra step.
• Dump‑and‑go — add the ingredients, pop the lid on, and walk away.
• Thick, rich gravy — from the gravy granules and stock pot, create the perfect sauce.
• Flexible ingredients — swap veg based on what you have.
• Family‑friendly — mild, comforting flavours everyone loves.

Dump‑and‑Go Slow Cooker Tips

• Chop vegetables into similar sizes so they cook evenly.
• Don’t add too much liquid — slow cookers create their own.
• Use good chicken gravy granules for the best flavour.
• Resist lifting the lid — every peek adds 20 minutes to cooking time.

Ingredient Notes

This recipe needs stock for the right balance of flavour and liquid. A splash of wine is optional, but stock is essential for richness and proper sauce consistency.

Do not add salt. The gravy granules provide all the seasoning you need — adding extra salt will make the dish far too salty.

Gravy

The gravy is what makes this casserole so good, so choose a brand that delivers great flavour. I recommend Bisto Best Chicken Gravy Granules, available in most supermarkets.

Ingredients

🍗 Chicken fillets

🥕 Carrots

🌿 Celery

🧅 Onion

🧄 Garlic

🍄 Chestnut mushrooms

🧅 Leek

🟡 English mustard

🌿 Dried mixed herbs

🍃 Bay leaf

🟫 Chicken gravy

🥣 Chicken stock

⚫ Black pepper

How to Make It

Prepare all the vegetables by peeling and chopping them into similar‑sized pieces so they cook evenly.

Add the chopped vegetables to the slow cooker along with the diced chicken. Scatter over the dried mixed herbs, mustard, black pepper, and the bay leaf.

Add the chicken stock pot and the gravy granules (see recipe card for exact amounts and full recipe instructions). Don’t worry if it looks like there isn’t much liquid — slow cookers naturally create moisture as the vegetables cook.

If you add too much liquid now, you’ll struggle to thicken the sauce later without using a whole jar of gravy granules! Trust the process — it works.

Give everything a good stir, then pop the lid on.

Which Slow Cooker Setting to Use?

Cook on LOW for 7–8 hours, MEDIUM for 5 hours, or HIGH for 4–5 hours. I cooked mine on high because it was getting late, and it turned out perfectly cooked in 5 hours.

The gravy becomes beautifully rich and glossy — perfect with creamy mashed potatoes.

Serving Suggestions

This casserole is perfect with mashed potatoes, rice, or crusty bread. It also reheats beautifully, making it ideal for batch cooking or next‑day lunches.

Variations

• Add bacon: A handful of chopped smoked bacon adds extra savoury depth.
• Add peas or sweetcorn: Stir in during the last 30 minutes for colour and sweetness.
• Add dumplings: Pop them on top for the final 30 minutes — lid back on, no peeking.
• Add cream: A splash of double cream at the end makes the sauce richer and silkier.
• Make it gluten‑free: Use gluten‑free gravy granules and stock.

Money‑Saving Top Tips

• Look out for end‑of‑day supermarket discounts — vegetables are often still perfectly fresh and ideal for casseroles.
• Meat reductions can be fantastic value; chicken fillets freeze well, so stock up when they’re cheap.
• Pre‑chopped vegetables can be pricey, but when they’re on offer (3‑for‑2 etc.), they can be cheaper than buying individually.
• Slow cooker meals are brilliant for stretching ingredients — extra veg makes the dish go further without adding cost.

Storage & Freezing

• Fridge: Keeps for up to 3 days in an airtight container.
• Freezer: Freeze for up to 3 months. Defrost overnight in the fridge.
• Reheat: Microwave or gently heat on the hob until piping hot.

You Might Also Like

• Slow Cooker Chicken Casserole with Campbell’s Soup
• More Slow Cooker Recipes

Have you tried this recipe?
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slow cooker chicken casserole, easy slow cooker chicken casserole, easy crock pot chicken casserole

Slow Cooker, One Pot, Chicken

English

Yield: 3-4

Author: Jan Bennett

Easy Slow Cooker Chicken Casserole

A cosy, dump‑and‑go slow cooker chicken casserole with tender vegetables and a rich, thick gravy.

Prep time: 10 MinCook time: 7 HourTotal time: 7 H & 10 M

Ingredients

• 2–3 skinless chicken breast fillets
• 2 carrots
• 2 stalks of celery
• 1 clove garlic
• 1 large onion
• 4–6 chestnut (brown) mushrooms
• 1 leek
• 1 heaped tbsp mustard (Coleman’s English mustard)
• 1 tsp dried mixed herbs (Italian blend)
• 1 bay leaf
• Pinch of black pepper (don’t add salt)
• 1 Knorr chicken stock pot
• 300ml boiling water
• 2 tbsp Bisto Best Chicken gravy granules (plus extra for thickening)

Instructions

1. Prepare the vegetables: slice the carrots; clean the celery, remove any stringy bits and slice thinly; finely chop or mince the garlic; peel and slice the onion; slice the mushrooms; clean and slice the leek. Cut the chicken breast fillets into large chunks.
2. Add all the prepared ingredients to the slow cooker. Sprinkle in the dried mixed herbs, add the mustard, bay leaf, black pepper, and the Knorr stock pot.
3. Dissolve 2 tablespoons of gravy granules in 300ml of boiling water, then pour it into the slow cooker. Stir everything well to combine.
4. Place the lid on the slow cooker and cook on LOW for 7–8 hours or HIGH for 4–6 hours. Slow cookers vary, so check your model’s instructions.
5. Once fully cooked, remove and discard the bay leaf. Turn the slow cooker to HIGH and take off the lid.
6. Mix half a cup of liquid from the pot with 2–3 tablespoons of gravy granules, then pour it back into the slow cooker — this helps prevent lumps. Leave the lid off and let the casserole thicken for a few minutes, adding more gravy granules if needed.
7. Taste and adjust the seasoning, then serve.

Notes

To serve 4, just add another chicken fillet.Instead of mashed potatoes, and for less work, you could add baby new potatoes - just cut them in half and throw them in at the beginning.

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