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French Onion Chicken Casserole Recipe Easy Comforting Dinner with Crispy Gruyère Topping

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A comforting French onion chicken casserole featuring caramelized onions, tender chicken breasts, and a crispy Gruyère cheese topping. Perfect for cozy weeknight dinners with simple ingredients and rich flavors.

Ingredients

Scale
  • 4 boneless, skinless chicken breasts (about 1.5 lbs / 680 g)
  • 2 tablespoons olive oil or unsalted butter (for browning)
  • Salt and freshly ground black pepper, to taste
  • 4 large yellow onions, thinly sliced
  • 2 tablespoons unsalted butter (for caramelizing onions)
  • 1 teaspoon sugar (optional)
  • 1/4 cup dry white wine or dry sherry (about 60 ml / 1/4 cup)
  • 2 cloves garlic, minced
  • 1 teaspoon fresh thyme leaves or 1/2 teaspoon dried thyme
  • 1 cup chicken broth (240 ml / 1 cup), preferably low sodium
  • 1/2 cup heavy cream or half-and-half (120 ml / 1/2 cup)
  • 1 tablespoon all-purpose flour
  • 1 cup shredded Gruyère cheese (about 100 g / 3.5 oz)
  • 1/2 cup panko breadcrumbs (about 50 g / 1.75 oz)
  • 1 tablespoon unsalted butter, melted (for topping)

Instructions

  1. Preheat your oven to 375°F (190°C).
  2. Prepare the caramelized onions: In a skillet, melt 2 tablespoons butter over medium heat. Add sliced onions, sprinkle with salt and optional sugar. Stir occasionally for 25-30 minutes until golden brown and soft. Add minced garlic and thyme during the last 5 minutes. Pour in white wine or sherry and cook until mostly evaporated, about 3-4 minutes. Remove from heat and set aside.
  3. Brown the chicken: Season chicken breasts with salt and pepper. Heat 2 tablespoons olive oil over medium-high heat in a separate pan. Sear chicken breasts for 3 minutes on each side until golden but not fully cooked. Remove and let rest.
  4. Make the creamy sauce: In the same pan used for chicken, reduce heat to medium and add 1 tablespoon butter. Stir in flour and cook for 1-2 minutes until lightly golden, whisking constantly. Gradually add chicken broth and cream, whisking to avoid lumps. Simmer for 3-4 minutes until sauce thickens. Season with salt and pepper to taste.
  5. Assemble the casserole: Spread half of the caramelized onions on the bottom of a 9×13-inch baking dish. Place chicken breasts on top, spoon creamy sauce evenly over them, then top with remaining caramelized onions.
  6. Prepare the topping: In a bowl, mix shredded Gruyère, panko breadcrumbs, and melted butter. Sprinkle evenly over the casserole.
  7. Bake: Place dish in preheated oven and bake for 20-25 minutes until topping is golden brown and crispy and chicken reaches an internal temperature of 165°F (74°C). Tent loosely with foil if topping browns too quickly.
  8. Rest and serve: Let casserole rest for 5 minutes before serving to allow juices to redistribute.

Notes

Do not rush caramelizing onions to avoid bitterness; use a wide heavy pan for even browning. Let chicken rest after searing to keep it juicy. Whisk continuously when making the sauce to avoid lumps. For crispier topping, broil for last 2-3 minutes watching closely. Can be made ahead and baked before serving. Use gluten-free flour and breadcrumbs for gluten-free version. Dairy-free substitutions include olive oil, coconut cream, and dairy-free cheese.

Nutrition

Keywords: French onion chicken casserole, comfort food, caramelized onions, Gruyère topping, easy dinner, weeknight casserole, creamy chicken bake

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