Craving a dish that combines the rich, savory flavors of French onion soup with the comfort of a hearty chicken casserole? Look no further. Our French Onion Soup Chicken Casserole offers the best of both worlds. This dish is perfect for home cooks and French cuisine lovers who want to bring a touch of gourmet comfort to their table.

french onion soup chicken casserole


To get started, you'll need the following ingredients:

  • Chicken Breasts (4 boneless, skinless)
  • Onions (3 large, thinly sliced)
  • Garlic (3 cloves, minced)
  • Thyme (2 teaspoons, dried or fresh)
  • Gruyère Cheese (2 cups, grated)
  • Beef Broth (2 cups)
  • Butter (4 tablespoons)
  • Olive Oil (2 tablespoons)
  • Flour (2 tablespoons)
  • Salt and Pepper (to taste)
  • Baguette Slices (optional, for serving)

Step-by-Step Instructions

Step 1: Preheat and Prep

  1. Preheat your oven to 375°F (190°C).
  2. Season the chicken breasts with salt and pepper on both sides.

Step 2: Sauté the Onions

  1. In a large skillet, heat the butter and olive oil over medium heat.
  2. Add the thinly sliced onions and cook until caramelized about 20-25 minutes. Stir frequently to avoid burning.
  3. Add the minced garlic and thyme, cooking for another 2-3 minutes.

Step 3: Prepare the Chicken

  1. Remove the caramelized onions from the skillet and set them aside.
  2. In the same skillet, add the chicken breasts and sear on both sides until golden brown. This should take about 4-5 minutes per side.

Step 4: Create the Sauce

  1. Sprinkle flour over the onions and mix well.
  2. Gradually add the beef broth, stirring constantly until the mixture thickens into a rich sauce.

Step 5: Assemble the Casserole

  1. In a baking dish, layer half of the caramelized onions and sauce.
  2. Place the seared chicken breasts on top.
  3. Add the remaining onions and sauce over the chicken.
  4. Sprinkle the grated Gruyère cheese evenly over the top.

Step 6: Bake

  1. Bake in the preheated oven for 25-30 minutes, or until the cheese is bubbly and golden brown.

Tips for Perfecting the Dish

  • Caramelizing Onions: Patience is key! Cook the onions slowly over medium heat to develop rich, sweet flavors.
  • Layering Cheese: For an even melt and delicious crust, spread the Gruyère cheese uniformly over the casserole.
  • Beef Broth: Use high-quality beef broth for a richer, more flavorful sauce.

Serving Suggestions

Pair your French Onion Soup Chicken Casserole with these complementary side dishes to round out your meal:

  • Simple Green Salad with a light vinaigrette
  • Steamed Vegetables like broccoli or green beans
  • Crispy Baguette Slices for soaking up the savory sauce


This French Onion Soup Chicken Casserole is sure to become a favorite in your home. Rich, comforting, and full of flavor, it's the perfect dish for any occasion. We’d love to hear about your cooking experience and any variations you’ve tried! Share your thoughts and photos in the comments below.

Happy Cooking!

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