French Onion Chicken Casserole

French Onion Chicken Casserole

from southernliving.com
65 min
6 servings

This cheesy, creamy French Onion Chicken Casserole is comforting and indulgent, but also fancy enough for company. Serve with salad and bread for a classic weeknight dinner.

Ingredients

  • Cooking spray
  • 3 Tbsp. olive oil
  • 2 large (12 oz. each) yellow onions, thinly sliced (about 5 cups)
  • 1 tsp. kosher salt
  • 0.5 tsp. black pepper
  • 2 Tbsp. unsalted butter
  • 2 garlic cloves, minced (about 2 tsp.)
  • 0.25 cup all-purpose flour
  • 1 cup chicken broth
  • 1 cup frozen sweet peas, thawed
  • 3 cups chopped cooked chicken (12 oz.)
  • 1 cup sour cream
  • 0.5 cup mayonnaise
  • 2 Tbsp. chopped fresh flat-leaf parsley
  • 1 cup crispy fried onions (such as French's)
  • 4 oz. pre-shredded low-moisture part-skim mozzarella cheese (about 1 cup)
  • 2 oz. Gruyère cheese, shredded (about 1/2 cup)

Directions

  1. 1

    Prepare oven and baking dish: Preheat oven to 350°F. Coat a 11-x 7-inch or 2 1/2-quart baking dish with cooking spray.

  2. 2

    Cook onion mixture: Heat oil in a large skillet over medium. Add onions, and cook, covered, stirring occasionally, until soft and starting to brown, 10 to 12 minutes. Uncover; stir in salt and pepper. Re-cover; cook, stirring occasionally, until golden brown and very soft, 8 to 10 minutes. Uncover. Stir in butter and garlic, and cook, stirring constantly, until fragrant and butter has melted, about 1 minute. Sprinkle flour over onion mixture, and cook, stirring often, until well incorporated, about 1 minute. Stir in broth, and bring to a simmer over medium, scraping bottom of skillet to release browned bits. Remove skillet from heat; stir in peas. Let cool 5 minutes.

  3. 3

    Make chicken mixture: Meanwhile, stir together chicken, sour cream, mayonnaise, and parsley in a large bowl.

  4. 4

    Combine onion mixture and chicken mixture: Add onion mixture to chicken mixture in large bowl, and stir until well combined. Transfer mixture to prepared baking dish, and sprinkle with fried onions, mozzarella, and Gruyère.

  5. 5

    Bake casserole: Bake in preheated oven until cheese is melted and sides are golden brown, 25 to 30 minutes. Remove from oven, and let cool 5 minutes. Serve.