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Step-by-step process of making a creamy chicken casserole, showing the chicken and mushrooms simmering in a rich, creamy sauce in a skillet.

French Chicken Casserole (The Ultimate Comfort Food)

This French Chicken Casserole is a creamy, comforting, and elegant dish made with tender chicken, mushrooms, and a savory white wine sauce, topped with golden Gruyère cheese. Perfect for a weeknight dinner or special occasion!
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Prep Time 15 minutes
Cook Time 30 minutes
Total Time 45 minutes
Servings: 6 people
Course: Dinner, Main Course
Cuisine: French
Calories: 520
Ingredients Equipment Method Notes

Ingredients
  

  • 2 lbs boneless, skinless chicken breasts cut into 1-inch cubes
  • 1 tbsp olive oil
  • 8 oz cremini mushrooms sliced
  • 1 medium onion finely chopped
  • 3 cloves garlic minced
  • 1/2 cup dry white wine like Sauvignon Blanc
  • 2 tbsp all-purpose flour
  • 1 cup chicken broth
  • 1 cup heavy cream
  • 1 tbsp Dijon mustard
  • 1 tbsp fresh thyme chopped
  • Salt and black pepper to taste
  • 1 cup Gruyère cheese shredded
  • 1/2 cup Panko breadcrumbs
  • 2 tbsp butter melted

Equipment

  • 1 Large oven-safe skillet or Dutch oven
  • 1 9x13 inch baking dish (if skillet is not oven-safe)
  • 2 Mixing Bowls

Instructions
 

  1. Preheat oven to 375°F (190°C). Season chicken cubes with salt and pepper.
  2. Heat olive oil in a large oven-safe skillet over medium-high heat. Add chicken and cook until golden brown on all sides. Remove from skillet and set aside.
  3. In the same skillet, add the chopped onion and cook until softened (3-4 minutes). Add the sliced mushrooms and cook until browned. Stir in the minced garlic and cook for 1 more minute.
  4. Deglaze the pan with white wine, scraping up any browned bits. Simmer for 2-3 minutes until slightly reduced. Stir in the flour and cook for 1 minute.
  5. Gradually whisk in the chicken broth and heavy cream until the sauce is smooth. Stir in Dijon mustard and fresh thyme. Bring to a simmer and cook for 5 minutes until thickened.
  6. Return the chicken to the skillet and stir to combine. (If skillet is not oven-safe, transfer mixture to a 9x13 inch baking dish).
  7. In a small bowl, mix together the shredded Gruyère, Panko breadcrumbs, and melted butter. Sprinkle this topping evenly over the casserole.
  8. Bake for 20-25 minutes, until the sauce is bubbling and the topping is golden brown. Let rest for 5-10 minutes before serving.

Notes

For the best flavor, use a good quality dry white wine.
Shred your own Gruyère cheese for the creamiest melt.
Let the casserole rest before serving to allow the sauce to set.
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