French Onion Chicken Casserole

French Onion Chicken Casserole

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 yellow onions

    thinly sliced, 12 oz. each

  • 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.

French Onion Chicken Casserole

French Onion Chicken Casserole

65 min6 servings

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About this Recipe

Imagine a dish that brings the rich, savory depth of classic French onion soup together with the comforting warmth of a chicken casserole. This French Onion Chicken Casserole delivers just that—a creamy, cheesy delight that's perfect for a cozy weeknight or elegant enough for company. You'll love how this recipe transforms simple ingredients into something truly special.

This French Onion Chicken Casserole works because it masterfully blends the sweet, complex richness of tender caramelized onions with succulent cooked chicken in a luscious, savory sauce. Topped with a blend of melty mozzarella and nutty Gruyère, and a generous layer of crispy fried onions, it creates layers of flavor and texture that are truly irresistible in every forkful.

What to expect from this dish is a supremely comforting meal with deeply savory, slightly sweet notes from the patiently cooked onions, balanced beautifully by the creamy tang of sour cream and mayonnaise. The texture is a delightful contrast of tender chicken and soft onions encased in a rich, velvety sauce, all crowned with bubbly, golden cheese and a satisfying crunch from the fried onions. It's an indulgent yet approachable experience that promises a hearty and flavorful dinner for six, coming together in about 65 minutes total.

Feel free to customize this casserole to fit your pantry or preferences. While chopped cooked chicken is called for, using a pre-cooked rotisserie chicken makes prep incredibly fast. For a slightly different flavor profile, you could experiment with other good melting cheeses like provolone or fontina alongside (or instead of) the mozzarella and Gruyère. For an extra touch of green, a handful of fresh spinach could be stirred in with the frozen peas.

This indulgent French Onion Chicken Casserole is a fantastic choice for a comforting family dinner or a relaxed gathering with friends. Serve it alongside a crisp green salad and some crusty bread to soak up every last bit of the rich, flavorful sauce.

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