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“A baked French onion chicken casserole with golden caramelized onions and melted cheese, being scooped out to show its creamy, cheesy texture.”

French onion chicken casserole

This French Onion Chicken Casserole is a creamy, cheesy comfort dish made with caramelized onions, tender chicken, and a crispy topping that bakes to golden perfection. Inspired by a kitchen mishap, this easy casserole has become a family staple—ready in about an hour and perfect for busy weeknights or make-ahead meals.
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Prep Time 25 minutes
Cook Time 35 minutes
Cooling & resting 9 minutes
Total Time 1 hour 9 minutes
Servings: 6 servings
Course: Main Course, Dinner, Comfort Food
Cuisine: American, French-Inspired
Calories: 620
Ingredients Equipment Method Nutrition Notes

Ingredients
  

For the Protein Base
  • 1.5 lbs Boneless chicken breasts or thighs Cut into bite-sized pieces
  • 3 cloves Garlic Minced
  • ½ teaspoon Black pepper Freshly ground
  • 1 teaspoon Salt
For the French Onion Mixture
  • 4 large Yellow onions Thinly sliced
  • 3 tablespoon Butter For caramelizing
  • ½ cup Beef broth Adds depth of flavor
  • 1 tablespoon Worcestershire sauce
  • 1 teaspoon Fresh thyme leaves Substitute ½ teaspoon dried thyme
For the Creamy Layer
  • 1 can Cream of chicken soup 10.5 oz
  • ½ cup Sour cream
  • ½ cup Heavy cream
  • 1 tablespoon Dijon mustard Adds tanginess
  • 1 cup Gruyère cheese Shredded
  • 1 cup Mozzarella cheese Shredded
  • ½ cup Swiss or provolone Optional
  • ¼ cup Parmesan cheese Grated
  • 2 tablespoon Butter Melted
  • 1 cup French fried onions
  • ½ cup Panko breadcrumbs

Equipment

  • 1 Large Skillet (12-inch works best for caramelizing onions)
  • 1 9x13 inch baking dish (Glass or metal pan)
  • 1 Mixing Bowls (For sauce and topping)
  • 1 Wooden Spoon (For stirring onions and chicken)
  • 1 Sharp Knife (For slicing onions)

Method
 

  1. Slice 3–4 onions thinly. Melt butter in skillet over medium-low heat. Add onions with a pinch of salt and cook slowly for 25–30 minutes, stirring every 5 minutes until deep golden brown.
  2. Stir in minced garlic, thyme, and Worcestershire sauce during the last 2 minutes of cooking.
    “A skillet of caramelized onions cooked to golden brown perfection, glistening with butter and ready to be added to the casserole.”
  3. Season chicken with salt and pepper. Push onions aside and sear chicken in same skillet until lightly golden (doesn’t need to be fully cooked). Pour in beef broth and simmer 5 minutes.
  4. Move chicken and onion mixture into a greased 9x13-inch baking dish. Spread evenly.
  5. In a bowl, whisk together cream of chicken soup, sour cream, heavy cream, and Dijon mustard

Nutrition

Serving: 400gCalories: 620kcalCarbohydrates: 21gProtein: 44gFat: 38gSaturated Fat: 19gPolyunsaturated Fat: 3gMonounsaturated Fat: 12gCholesterol: 155mgSodium: 980mgPotassium: 720mgFiber: 7gSugar: 2gVitamin A: 950IUVitamin C: 7mgCalcium: 290mgIron: 2.4mg

Notes

Nutrition information is automatically calculated and should be considered an approximation. Actual values may vary based on specific ingredients used and portion sizes

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