This French onion chicken casserole is creamy, rich, and aromatic. It has all the components of French onion soup—plus chicken—even a crisp crouton topping.
Prep Time::15 mins
Cook Time::35 mins
Rest Time::10 mins
Total Time:: 1 hr
Servings::8
Ingredients
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2 tablespoons unsalted butter
1 1/2 cups chopped yellow onion
1/2 cup chopped celery
1/2 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 (10.5 ounce) can condensed French onion soup
1/4 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 1/2 whole rotisserie chickens)
1 (5 ounce) package seasoned croutons
Directions
Gather all ingredients. Preheat the oven to 350 degrees F (175 degrees C).
Dotdash Meredith Food Studios
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.
Dotdash Meredith Food Studios
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.
Dotdash Meredith Food Studios
Transfer to a 9×13-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.
Dotdash Meredith Food Studios