Easy slow cooker chicken casserole recipe
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When the colder nights come there is nothing better in our household than a nice slow cooker dinner. This easy slow cooker chicken casserole recipe is ALWAYS a winner.
It is a great way to enjoy lots of vegetables, is frugal and takes just minutes to prepare too. You can spend just 5-10 minutes getting this ready and in your slow cooker pot and then leave it to cook for the whole day.
This easy slow cooker chicken casserole recipe can cook on low all day, or even overnight, or can be cooked on high in just a few hours, for those days when you don't have time.
If you're cutting back on your meat consumption check out this Vegetable Stew instead.
If you want to get started right away with my easy slow cooker chicken casserole recipe then skip to the end of this post for the full recipe card. Be sure to check out my slow cooker tips while you're here too.
This chicken cordon bleu casserole is a great recipe if you're looking for something with a little more pizzazz.

Ingredients for my easy slow cooker chicken casserole recipe
10g butter
10ml olive oil
2 medium onions
350g chicken breast pieces
1 tablespoon plain flour
Garlic salt
400g potatoes
200g carrots (or 1 tin of sliced carrots)
300g mushrooms (or 1 tin of sliced mushrooms)
500ml chicken stock (I use 2 low-salt stock cubes)
1 tsp English mustard
1 tsp thyme
½ teaspoon oregano
½ teaspoon celery salt
2 bay leaves
Method for my easy slow cooker chicken casserole recipe
Chop the onion and fry in the butter and olive oil until lightly brown.

Add the onion to the slow cooker pot.
Wash potatoes and chop into bitesize pieces.

Season and flour your chicken breast pieces. Brown lightly in a pan. As I was in a hurry I did not cook through but just seared the outside of each piece.

Add your carrots, mushrooms, mustard, celery salt and herbs.

Add 500ml of chicken stock.
Stir well.
Add 2 bay leaves.

Slow cook on high for 4 hours or low for 8 hours. Can be left longer if desired, including overnight on low.
Remove bay leaves and serve.

Best herbs for chicken casserole
Personally I feel that thyme works SO well but I also love tarragon, lemon and garlic or rosemary and garlic. I sometimes use leftover air fryer rosemary chicken breast to make an easy version of this.
ALL of the slow cooker recipes on this website have been cooked using a Ninja Foodi OL750UK, or a previous Ninja multi-cooker model, but you can use ANY slow cooker, as timings should be very similar.

Simple slow cooker chicken casserole recipe:
easy slow cooker chicken casserole recipe
Ingredients
- 10 g butter
- 10 ml olive oil
- 2 medium onions
- 350 g chicken breast pieces
- 1 tablespoon plain flour
- ¼ teaspoon garlic salt
- 400 g potatoes bite-sized dice
- 200 g carrots or 1 tin of sliced carrots
- 300 g mushrooms or 1 tin of sliced mushrooms
- 500 ml chicken stock I use 2 low-salt stock cubes
- 1 tsp English mustard
- 1 tsp thyme
- ½ teaspoon oregano
- ½ teaspoon celery salt
- 2 bay leaves
Instructions
- Chop the onion and fry in the butter and olive oil until lightly brown.
- Add the onion to the slow cooker pot.
- Wash potatoes and chop into bitesize pieces then add to slow cooker pot.
- Season and flour your chicken breast pieces. Brown lightly in a pan. As I was in a hurry I did not cook through but just seared the outside of each piece.
- Add your carrots, mushrooms, mustard, celery salt and herbs.
- Add 500ml of chicken stock.
- Stir well.
- Add 2 bay leaves.
- Slow cook on high for 4 hours or low for 8 hours. Can be left longer if desired, including overnight on low.
- Remove bay leaves and serve.
Nutrition
Note: All calorie information is for demonstration purposes only and is based on the specific uncooked ingredients that I used when creating the recipe.
I love how this easy slow cooker chicken casserole recipe takes just minutes to prepare. It is perfect for the mornings when you have school runs, are racing off to work or just short on time/effort.
Want to make a chicken casserole with dumplings?
Ingredients for dumplings:
100g plain flour
50g suet
Enough water until you get a wet, slightly sticky dough – I usually find a couple of tablespoons are enough.
Method for chicken casserole dumplings:
Mix together the dough. Add the water very slowly so it doesn't become too wet.
One hour before serving the casserole drop the dumplings in. I make 8-10 dumplings, so they are quite small, and 1 hour is sufficient time for them to be cooked and lovely and fluffy inside.
Can you make a chicken casserole with chicken soup?
Yes! Skip the chicken stock and use a can of soup instead for a richer, creamier casserole. Cream of chicken soup will work best!
Do you need to use chicken breast for this casserole recipe?
No! I use chicken breast as that is usually what I have in but chicken legs, chicken thighs or even chicken drumsticks can work really well for this recipe.
Want to add a splash of wine?
When you brown the chicken you'll want to add the wine then, to cook off some of the alcohol!
Like this recipe? Fancy trying one of my other slow cooker dinners? Here are some great ones:
Gammon with balsamic glaze in the slow cooker
Beef chilli in the slow cooker
Why not try one of these fantastic slow cooker accessories:
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That sounds totally delicious! I love a good casserole. Especially at this time of year.
We love a bit of comfort food at this time of year!
I use my slow cooker at least twice a week in the autumn/winter. thank you for this recipe.
It's great at this time of year to come home to a warm dinner isn't it!
This is a very nice and yummy recipe for the colder days now, thank you for sharing.
I really need to get my slow cooker out of the cupboard and get a bit more organised. I love making casseroles etc and this just looks absolutely delicious!
Do! It's great to come home to a hot dinner!
We love our slow cooker, there is so many lovely recipes you can create with them. This looks very tasty
I can't get enough of using my slow cooker!
Think looks super yummy and so easy to make. I love my cooker but never think to do a chicken casserole usually it's gammon beef or pork to put with a dinner.
It's SO simple (and cheap!).
Thanks so much - it's So delicious! My husband just made it again this week and it was even better than I remembered.