French Onion Noodle Casserole

This French Onion Noodle Casserole is comfort food at its best! A creamy, cheesy filling surrounds delicious egg noodles with hints of caramelized onions and a crispy fried onion topping.

Try my French Onion Smothered Pork Chops next!

French onion noodle casserole in a large casserole dish with spatula pulling up the noodles

I’m not sure I would do so well in a world without casseroles. They’re just so creamy, usually freeze well, (if you actually have leftovers), and they’re easy to customize and throw together.

Let’s get into the deets!


The Best Cheese for Casseroles

Cheese is always creamier and melts better if you shred it fresh at home, as opposed to buying it pre-shredded.

Low moisture mozzarella melts the best and is what you’ll want to use in this recipe.

Can You Freeze Leftover Casserole?

  • Reames Frozen Egg Noodles hold up well when frozen. Creamy casseroles such as this won’t have quite the same flavor or consistency when reheated, but freezing is definitely a fine way to make use of leftovers.
  • When ready to reheat, let the casserole defrost in the fridge for 24 hours, then reheat at 350°, covered, for about 20 minutes.
  • Frozen casserole is best if used within 3 months of freezing.

A big pot of french onion noodle casserole with package of reames egg noodles behind it

Using Rotisserie Chicken in Casseroles

I love the convenience of using rotisserie chicken in casseroles because it eliminates the steps in having to cook the chicken, and rotisserie chicken packs a ton of flavor.

If you do happen to cook your own chicken:

  • Add a tablespoon of vegetable oil to your skillet and sear the chicken on each side before you cook the onions.
  • Remove the chicken and proceed with cooking the onions afterwards. The benefit of doing it this way is that the seared chicken adds even more flavor to the pan which transfers into the casserole!

Close up shot of french onion noodle casserole in large pot

Try These Casseroles Next!

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French Onion Noodle Casserole

3.85 from 13 votes
This French Onion Noodle Casserole is comfort food at its best! A creamy, cheesy filling surrounds savory Reames Frozen Egg Noodles  with hints of caramelized onions and a crispy fried onion topping.


  • 4 Tablespoons butter
  • 3 medium onions, thinly sliced
  • 12 oz. Reames Homestyle Egg Noodles, can be found in the frozen section
  • 1 cup sour cream
  • 2 (10.5 oz.) cans cream of chicken soup
  • 1 cup chicken broth, separated
  • 1 cup grated mozzarella
  • 2 cups rotisserie chicken, diced
  • 1 cup crispy fried onions


  • Preheat oven to 350 degrees.
  • In a large, oven-safe skillet, melt the butter and add the onions. Simmer over medium heat, stirring occasionally, for about 20 minutes, until the onions begin to turn brown and caramelize.
  • While the onions caramelize, cook the egg noodles in a separate pan according to package instructions. Drain, set aside.
  • Add the sour cream, cream of chicken soup, and half chicken broth. Use a silicone spatula to stir in the egg noodles. Add half of the mozzarella cheese and the chicken.
  • Stir until the cheese is melted. If desired, add up to ½ cup more chicken broth.
  • Top with the remaining ½ cup mozzarella cheese and bake for 10 minutes.
  • Top with the crispy fried onions and bake for 5-10 more minutes, until the top is golden. Serve and enjoy!


Calories: 774kcal, Carbohydrates: 48g, Protein: 31g, Fat: 50g, Saturated Fat: 24g, Cholesterol: 172mg, Sodium: 1901mg, Potassium: 538mg, Fiber: 2g, Sugar: 6g, Vitamin A: 1210IU, Vitamin C: 10.7mg, Calcium: 270mg, Iron: 2.9mg