Go Back
–+ servings
French Onion Chicken Casserole

French Onion Chicken Casserole

This French onion chicken casserole is creamy, rich, and aromatic, featuring all the components of French onion soup with chicken.
Print Recipe Pin Recipe
Prep Time 15 minutes
Cook Time 35 minutes
Resting Time 10 minutes
Total Time 1 hour
Course main dish
Cuisine French
Servings 8 servings
Calories 621 kcal

Equipment

  • oven
  • Skillet
  • baking dish

Ingredients
  

  • 2 tablespoons unsalted butter
  • 1.5 cups chopped yellow onion
  • 0.5 cup chopped celery
  • 0.5 cup chopped carrot
  • 1 tablespoon finely chopped fresh garlic
  • 2 teaspoons fresh thyme leaves plus more for garnish
  • 1 teaspoon kosher salt
  • 1 teaspoon freshly ground black pepper plus more for garnish
  • 1 can condensed French onion soup 10.5 ounce
  • 0.25 cup dry white wine
  • 1 cup sour cream
  • 1 cup mayonnaise
  • 1 teaspoon Dijon mustard
  • 2 cups Gruyere cheese, shredded divided
  • 6 cups chopped rotisserie chicken (from 1 ½ whole rotisserie chickens)
  • 1 package seasoned croutons 5 ounce

Instructions
 

  • Gather all ingredients. Preheat the oven to 350 degrees F (175 degrees C).
  • Melt butter in a large skillet over medium heat. Add onion, celery, carrot, garlic, thyme, salt, and pepper; cook, stirring often, until onions are softened and translucent, 5 to 7 minutes.
  • Add French onion soup and wine, and bring to a simmer over medium heat. Simmer, undisturbed, until reduced and slightly thickened, 2 to 3 minutes. Stir in sour cream, mayonnaise, and mustard, and return to a simmer. Add 1 cup Gruyère, and cook, stirring constantly, until completely melted and combined, about 1 minute. Remove from heat, and fold in chicken.
  • Transfer to a 9x13-inch baking dish. Sprinkle croutons evenly over chicken mixture; sprinkle evenly with remaining Gruyère cheese. Bake in the preheated oven until bubbling and cheese is melted, 12 to 15 minutes. Let rest 10 minutes before serving. Garnish with additional thyme and pepper.

Notes

Recipe developed by Craig Ruff

Nutrition

Serving: 1servingCalories: 621kcalCarbohydrates: 23gProtein: 22gFat: 48gSaturated Fat: 16gCholesterol: 109mgSodium: 947mgPotassium: 366mgFiber: 2gSugar: 5gVitamin C: 5mgCalcium: 407mgIron: 2mg
Keyword Baked Dish, casserole, chicken, Comfort Food, French Onion Chicken Casserole, French onion soup
Tried this recipe?Let us know how it was!