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Creamy chicken casserole with carrots and herbs in a white Dutch oven, garnished with fresh parsley.

Chicken Casserole Recipe

Ella
This one-pot chicken casserole is the ultimate comfort food for busy weeknights. With juicy chicken thighs, fresh herbs, and a creamy sauce, it delivers deep flavor without complicated steps or hard-to-find ingredients.
Prep Time 15 minutes
Cook Time 1 hour
Total Time 1 hour 15 minutes
Course Dinner
Cuisine British, European
Servings 6 servings
Calories 410 kcal

Ingredients
  

For the base

  • 2 medium onions, finely diced
  • 2 leeks, trimmed, sliced, and rinsed
  • 3 celery sticks, thinly sliced
  • 500 g carrots, peeled and cut into chunks
  • 1 tbsp dried thyme

For the protein

  • 1000 g boneless, skinless chicken thighs, cut into large pieces

For the sauce

  • 50 g plain flour
  • 750 ml hot chicken stock
  • 2 tbsp wholegrain mustard
  • Sea salt and freshly ground black pepper to taste

To finish and serve

  • 4 tbsp crème fraîche
  • 1 bunch fresh parsley, finely chopped

Instructions
 

  • Place a large, heavy-based casserole dish on the stove over medium heat and let it warm evenly.
  • Add a splash of oil and sauté the onions, celery, carrots, and dried thyme for 5 minutes until fragrant and softened.
  • Stir in the sliced leeks and cook for another 2–3 minutes until slightly softened.
  • Add the chicken pieces and cook for about 5 minutes, turning until lightly browned on all sides.
  • Sprinkle in the plain flour and stir to coat all the ingredients evenly.
  • Slowly pour in the hot chicken stock, stirring constantly. Add the wholegrain mustard and deglaze the pan to incorporate all browned bits.
  • Bring to a light boil, then reduce heat to low. Cover and simmer for 45–60 minutes until vegetables are tender and sauce is thickened.
  • Turn off the heat and stir in the crème fraîche. Adjust seasoning with salt and pepper as needed.
  • Sprinkle with fresh parsley and serve hot with mashed potatoes, rice, or crusty bread.

Notes

If your sauce is too thin, mix 1 tablespoon of cornstarch with cold water and stir it in during the final 5 minutes of cooking.
For a second-day meal, turn leftovers into a pie with puff pastry baked at 190°C until golden.
To make this gluten-free, substitute plain flour with cornstarch or gluten-free flour blend.
For a richer version, stir in extra crème fraîche or a splash of double cream before serving.

Nutrition Facts (Per Serving)

  • Calories: 410
  • Total Fat: 18g
  • Saturated Fat: 6g
  • Cholesterol: 115mg
  • Sodium: 580mg
  • Carbohydrates: 22g
  • Fiber: 4g
  • Sugars: 6g
  • Protein: 35g
Note: Nutrition values are estimated and may vary based on specific ingredients used.
Keyword chicken casserole recipe, Comfort Food, Easy Chicken Dinner, one-pot chicken, simple chicken recipe