There’s something so comforting about a rich, delicious dinner that comes together in just one pan. This Creamy Chicken Mushroom One Pan Casserole Recipe is exactly that—a dreamy mix of tender chicken, earthy mushrooms, and a luscious cream sauce that you’ll want to wrap yourself in on chilly evenings.
Why You’ll Love This Recipe
- One Pan Wonder: You only need a single pan for cooking and clean-up, making weeknights a breeze.
- Creamy, Comforting Flavors: The sauce is perfectly balanced with cream, lemon, and thyme, giving it a fresh yet indulgent taste.
- Versatile Meal: You can cook it on the hob or finish it in the oven, and it pairs beautifully with many sides.
- Make Ahead & Freeze Friendly: Perfect for prepping in advance or saving leftovers for another day.
Ingredients You’ll Need
The ingredients come together to build layers of flavor—from the seared chicken coated in seasoned flour to the garlicky creamy mushroom sauce. Use fresh mushrooms and chicken for the best results, and don’t skip the lemon juice; it really brightens up the dish!
- Chicken breasts: Chunky pieces brown beautifully and stay juicy in the casserole.
- Plain flour: It helps coat the chicken and thickens the sauce—don’t swap for self-raising.
- Salt & black pepper: Simple seasoning that works wonders.
- Oil & unsalted butter: The perfect combo to cook chicken and soften onions without burning.
- Onions: Finely diced for melt-in-your-mouth sweetness.
- Garlic: Adds essential depth and warmth.
- Dried thyme: Earthy herb that pairs brilliantly with chicken and mushrooms.
- Celery salt (optional): Gives a subtle savory note—optional but lovely.
- Chicken stock: Use a good-quality one for rich flavor in your sauce.
- Milk: Whole or half-fat milk keeps your sauce smooth and creamy.
- Lemon juice: A little zing to cut through the creaminess.
- Chestnut mushrooms: Slice thickly to keep their texture and flavor.
- Double cream: For that indulgent, silky finish.
- Cornflour slurry (optional): Use this at the end if you want a thicker sauce.
- Parsley: Fresh and chopped, it’s a bright finishing touch.
- Serving veggies: Think mashed potatoes, sprouts, peas, and sweetcorn for a classic combo.
Variations
I love making this casserole my own depending on what’s in the fridge or the season. Feel free to mix it up—you can tweak the veggies or swap cream for a lighter option if you prefer.
- Add fresh herbs: I sometimes toss in chopped rosemary or sage for a more aromatic twist—my family goes crazy for it.
- Use other mushrooms: Try cremini, shiitake, or button mushrooms for different textures and flavor profiles.
- Dairy-free version: Swap cream and milk for coconut cream and almond milk—still creamy and delicious but dairy-free.
- Make it gluten-free: Use a gluten-free flour blend and cornstarch instead of plain flour for coating the chicken and thickening the sauce.
How to Make Creamy Chicken Mushroom One Pan Casserole Recipe
Step 1: Coat and Brown the Chicken
Start by tossing your chicken chunks with flour, salt, and pepper until they’re all nicely coated. This step is key—it helps you get a golden, flavorful crust when you sear the chicken. Heat oil in a large frying pan over high heat and brown the chicken in batches so they don’t steam. You’re just aiming for color here; they don’t need to be fully cooked yet. Set the browned chicken aside once done.
Step 2: Build the Flavor Base
In the same pan, melt the butter over low-medium heat to catch any yummy browned bits left behind. Add diced onions, minced garlic, thyme, and celery salt (if using), then cook gently until the onions soften, about 5 minutes. Sprinkle the flour over the softened onions and stir constantly for a minute until you notice the raw flour smell fading. This helps thicken your sauce later.
Step 3: Whisk in the Stock and Milk
Gradually pour in some of the chicken stock while whisking, making sure the mixture stays smooth. Keep adding stock a little at a time, whisking continuously to avoid lumps. Once all the stock is in, stir in the milk and keep cooking on low heat until the sauce thickens noticeably. This step takes patience but is what makes the sauce so creamy and beautiful. Finish it off by stirring in the fresh lemon juice to brighten all those rich flavors.
Step 4: Simmer the Mushrooms and Chicken
Add your thickly sliced mushrooms, the browned chicken pieces, and add salt and pepper to taste. Cover the pan with a lid and let everything simmer gently for about 20 minutes on the hob. This slow simmer melds all the flavors together and gently cooks the chicken through, keeping it tender and juicy.
Step 5: Add the Cream and Adjust Thickness
Take off the lid and stir in the double cream, letting it warm through for about 5 more minutes. This adds that irresistible silky texture. If you want your sauce a bit thicker, mix your cornflour with cold water to make a slurry and stir it in slowly until you reach your desired thickness.
Step 6: Serve and Garnish
Sprinkle freshly chopped parsley on top before serving. I love pairing this casserole with creamy mashed potatoes and a mix of peas, sweetcorn, and sprouts for a classic British comfort meal that fills the table with warmth—and compliments.
Pro Tips for Making Creamy Chicken Mushroom One Pan Casserole Recipe
- Don’t Overcrowd the Pan: Browning the chicken in batches keeps the pieces crisp on the outside and prevents steaming.
- Use Fresh Lemon Juice: I learned that fresh lemon juice brightens the sauce so much more than bottled, balancing the creaminess perfectly.
- Low and Slow Simmer: Keeping the heat low during simmering avoids tough chicken and mushy mushrooms.
- Cornflour Slurry for Thickness: Add it gradually and stir well to avoid lumps if you want a thicker sauce.
How to Serve Creamy Chicken Mushroom One Pan Casserole Recipe
Garnishes
I’m a big fan of simple parsley sprinkled on top—it adds a fresh, green pop of color and a mild herbaceous note. Sometimes I also sprinkle a little cracked black pepper for an inviting final touch.
Side Dishes
Mashed potatoes are my go-to; they soak up the creamy sauce perfectly. You’ll also love it with steamed sprouts, peas, and tender sweetcorn—classic sides that add color and balance.
Creative Ways to Present
For gatherings, I like to serve the casserole in a pretty ceramic dish straight from the oven, then place small ramekins with extra cream sauce or garnish on the side. It feels special but is incredibly easy!
Make Ahead and Storage
Storing Leftovers
After cooling, I store leftovers in an airtight container in the fridge—usually good for about 2-3 days. Reheating on the hob works well for me, just adding a splash of cream or milk if it’s thickened too much.
Freezing
This casserole freezes beautifully. I let it cool completely, cover tightly, and freeze it for up to 3 months. When I’m ready to enjoy, I thaw it overnight in the fridge and then warm it gently on the hob or in the oven.
Reheating
Reheat covered in the oven at 175°C (350°F) for about 20-25 minutes or stir frequently on medium heat on the stovetop until piping hot. Adding a little splash of milk or cream helps restore the perfect creamy texture after refrigeration or freezing.
FAQs
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Can I use other cuts of chicken for this recipe?
Absolutely! While chicken breasts work great for quick cooking and tender meat, you can use thighs for more flavor and juiciness. Just keep in mind thighs might take a little longer to cook through.
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Can I prepare this casserole in advance?
Yes, you can make the casserole ahead of time. Simply cool it after cooking, refrigerate for up to one day, and reheat gently before serving. It’s a fantastic meal prep dish!
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Is this recipe suitable for freezing?
Definitely! This creamy chicken mushroom one pan casserole freezes really well. Just cool it completely, cover tightly, freeze, and thaw overnight before reheating.
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Can I make this recipe dairy-free?
Yes, swap out the cream and milk for coconut milk or another creamy dairy-free alternative. Just keep an eye on thickness as dairy-free milks can behave differently when thickening.
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What should I serve with this casserole?
I recommend creamy mashed potatoes, steamed sprouts, peas, and sweetcorn. These classics complement the rich sauce and keep your meal balanced and colorful.
Final Thoughts
This Creamy Chicken Mushroom One Pan Casserole Recipe is one of those dishes that’s stood the test of time in my kitchen—it’s cozy, comforting, and so forgiving. Whether you whip it up last minute or prepare it ahead for a busy weeknight, you’ll find it’s always a crowd-pleaser. I genuinely hope you enjoy making and sharing it as much as my family does!
Print
Creamy Chicken Mushroom One Pan Casserole Recipe
- Prep Time: 15 minutes
- Cook Time: 50 minutes
- Total Time: 1 hour 5 minutes
- Yield: 10 servings 1x
- Category: Dinner
- Method: Stovetop
- Cuisine: British
Description
This creamy chicken and mushroom one pan casserole is a comforting British dinner perfect for batch cooking. Tender chicken breasts are coated in flour, browned, then simmered in a rich sauce made with mushrooms, onions, garlic, and cream. It can be cooked on the hob or baked in the oven, making it a versatile and delicious meal to enjoy with classic sides like mashed potatoes, sprouts, peas, and sweetcorn.
Ingredients
Chicken
- 5 chicken breasts (1 kg) chopped into big chunks or strips
- 45 g (6 tbsp) plain (all-purpose) flour
- ½ tsp salt
- ½ tsp black pepper
Sauce
- 2 tbsp oil
- 2 tbsp unsalted butter
- 3 small-to-medium onions peeled and finely diced
- 5 cloves garlic peeled and minced
- 1 tsp dried thyme
- ½ tsp celery salt (optional)
- 25 g (3 tbsp) plain (all-purpose) flour
- 1 litre (4 1/4 cups) chicken stock
- 300 ml (1 1/4 cups) milk (whole milk or half-fat)
- 2 tbsp freshly squeezed lemon juice (juice of approx. 1 lemon)
- 20 chestnut mushrooms thickly sliced
- ½ tsp salt
- ½ tsp pepper
- 240 ml (1 cup) double (heavy) cream
- 2 tbsp cornflour mixed with 5 tbsp cold water to make a slurry (cornstarch in USA) – optional
- Small bunch parsley chopped
To Serve
- Mashed potatoes
- Sprouts
- Peas
- Sweetcorn
Instructions
- Prepare the chicken: In a bowl, combine the chopped chicken breasts with flour, salt, and black pepper. Toss thoroughly until each piece is evenly coated in the flour mixture.
- Brown the chicken: Heat the oil in a large frying pan or skillet over high heat. Add the chicken in two batches, browning all sides but not cooking through. Remove with a slotted spoon and set aside.
- Cook the aromatics: In the same pan, melt the butter over low-medium heat. Add the diced onions, minced garlic, dried thyme, and celery salt (if using). Cook for 5 minutes until the onions soften.
- Make the roux: Sprinkle the flour over the softened onions and stir for about one minute until it forms a lumpy paste.
- Add chicken stock: Pour in a small amount of the chicken stock and whisk to combine, gradually adding the remaining stock while continuously stirring until you have a smooth sauce with no lumps, although the onions will still be present.
- Thicken the sauce: Add the milk and continue stirring over heat until the sauce thickens. Then stir in the freshly squeezed lemon juice.
- Add mushrooms and chicken: Add the sliced chestnut mushrooms, browned chicken pieces, salt, and pepper to the pan. Cover with a lid and simmer gently on the hob for 20 minutes, allowing flavors to meld.
- Oven cooking option: Alternatively, transfer the contents to a casserole dish, cover with foil, and bake in a preheated oven at 175°C (350°F fan) for 30 minutes.
- Finish with cream: Remove the lid and stir in the double cream. Heat through for an additional 5 minutes on the hob or place back in the oven if cooking there.
- Thicken if desired: For a thicker sauce, gradually stir in the prepared cornflour slurry a little at a time until the sauce reaches your preferred consistency.
- Serve: Garnish the casserole with chopped parsley and serve hot with mashed potatoes, sprouts, peas, and sweetcorn.
Notes
- You can make this dish ahead of time. Cool it, cover, and refrigerate for up to one day. Reheat thoroughly in the oven at 175°C (350°F) covered for 20-25 minutes or on the hob over medium heat for 10-15 minutes. Add a splash of cream or milk if needed to loosen the sauce.
- This casserole freezes well. Cool completely, cover, and freeze. Defrost thoroughly in the refrigerator before reheating in the oven or on the hob as above.
- To reduce quantities, halve all ingredients. Cooking times remain the same.
- The recipe has not yet been tested in a slow cooker. Feedback on this method would be appreciated for future updates.
Nutrition
- Serving Size: 1 serving
- Calories: 400 kcal
- Sugar: 5 g
- Sodium: 450 mg
- Fat: 25 g
- Saturated Fat: 12 g
- Unsaturated Fat: 10 g
- Trans Fat: 0 g
- Carbohydrates: 20 g
- Fiber: 2 g
- Protein: 30 g
- Cholesterol: 90 mg
