French Onion Chicken Casserole is made with chicken, pasta and green beans in a creamy sauce made from scratch and topped with crispy french fried onions. It’s the perfect comfort food for a busy weeknight!

Why I Love This Recipe

  • Creamy and Satisfying – The sauce is super creamy with a delicious onion flavor.
  • No Cream Soup – The sauce is made from scratch, made with milk, chicken broth, sour cream, and onion soup mix.
  • Feeds a Crowd – Easily get 8 servings from one casserole or double it and make two pans.

Ingredients Overview

  • Chicken Broth – I always opt for a low-sodium variety.
  • Flour and Butter – to make the roux for the sauce.
  • Milk – Any milk that you would typically use in a sauce. Nut milks are usually slightly sweet so keep that in mind as it could change the flavor of your sauce.
  • Sour Cream
  • Onion Soup Mix – Any brand, but I use Lipton.
  • Cooked Chicken – Cook fresh, or use meat from a store-bought rotisserie.
  • Green Beans – I just used canned green beans, but frozen could be thawed and added. If you want to use fresh green beans, you’ll need to at least par-boil them first.
  • Pasta – I like rotini but you could also use farfalle or penne.
  • Crispy Fried Onions

Make Ahead and Storage

Make Ahead: This is great for prepping ahead and baking later. Prepare the casserole a day in advance, cover with plastic wrap and refrigerate for 24 hours. Remove from the fridge 20 minutes prior to baking. *Do not add the fried onions until the last several minutes of the baking time.

Freezing Unbaked: Prepare the casserole but don’t bake it. Cover with plastic wrap and foil and freeze for up to 3 months. Thaw completely, then bake as directed. *Do not add the fried onions until the last several minutes of the baking time.

Storing Leftovers: Store in an airtight container in the refrigerator for up to 3-4 days and reheat in the microwave or oven. To freeze leftovers, store in a freezer container for up to 6 months. Thaw and reheat as desired.

Pro Tips

  • For a lighter casserole, use plain Greek yogurt in place of the sour cream.
  • Don’t overcook the pasta. In fact you could under-cook it slightly and it would be fine.
  • If you prefer, skip the fried onions on top and use Panko breadcrumbs instead.
  • Green beans could be swapped for another vegetable or omitted completely.
Pasta and chicken in a creamy sauce in a small bowl with a fork.

Chicken Casseroles to Try Next


  • 2 ½ cups chicken broth
  • ¾ cup all-purpose flour
  • 1 ½ cups milk
  • 1 cup sour cream
  • 1 packet onion soup mix
  • 3 cups diced cooked chicken
  • 2 15- ounce cans green beans drained (or 2 ½ cups fresh or frozen)
  • 12 ounces uncooked rotini
  • 2 cups french fried onions
  • Preheat oven to 350 degrees F.

  • Bring a pot of salted water to boil over medium-high heat. Add the pasta and cook to package directions. Drain and set aside.

  • Meanwhile, in a medium saucepan over medium heat, bring chicken broth and half a cup of milk to a simmer. While the broth is coming to a simmer, whisk together flour and remaining 1 cup of milk in a small bowl until thick and smooth. Pour into the saucepan with the broth and continue whisking over low heat while it simmers. Continue to whisk until thickened; about 5 minutes. Remove from heat.

  • In a large bowl, combine thickened chicken broth mixture, sour cream and onion soup mix until well mixed. Add chicken, noodles and green beans and stir to coat completely. Pour into a large baking dish. Cover with foil and bake for 25-30 minutes.

  • Uncover and top with the french fried onions; bake for an additional 5-7 minutes or until onions are crispy and golden brown.

  • Cool for several minutes. Garnish with fresh minced parsley if desired.

You’ll want to let your French Onion Chicken Casserole sit for several minutes to cool, which is a great time to whip up a quick salad to serve on the side!

Calories: 512kcalCarbohydrates: 61gProtein: 25gFat: 18gSaturated Fat: 8gPolyunsaturated Fat: 1gMonounsaturated Fat: 3gCholesterol: 63mgSodium: 865mgPotassium: 606mgFiber: 5gSugar: 8gVitamin A: 1011IUVitamin C: 13mgCalcium: 152mgIron: 3mg

Keyword chicken casserole, french onion chicken


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