Our Most Popular French Onion Recipe is A Cozy Weeknight Dinner

Published on February 12, 2026

A steaming bowl of bistro-style French onion soup will always have a special place in our hearts, but we also love a riff on a classic. In fact, our readers' all-time favorite French onion recipe isn't a soup at all. French Onion Chicken Casserole has all the familiar flavors, plus tender chicken, a tangy, creamy broth, and crispy fried onions on top.

Why We Love French Onion Chicken Casserole

Casseroles are always a hit around here. They're cozy, often require just one baking dish, and easily satisfy a hungry crowd. This particular casserole has a lot going for it: sweet, jammy caramelized onions and shredded chicken in a creamy, tangy sauce topped with golden French fried onions. Of course, there's plenty of melty cheese on top, too.

Tips For Making This Chicken Casserole

Keep these tips in mind when making this easy chicken recipe:

• Onions are the star of the show here, so be patient when cooking them on the stove. Low heat and time will give you the sweetest caramelized flavor. Keep an eye on your onions and reduce the heat as necessary until they're uniformly deep golden brown.
• Leftover cooked or store-bought rotisserie chicken both work great in this recipe. We like a mix of light and dark meat.
• For full control of the flavor, use homemade chicken broth. Of course, store-bought also works. Opt for low-sodium for this recipe. You could also use beef broth, which is traditional in French onion soup.
• Frozen peas are an easy way to add a pop of freshness and green to this creamy casserole. You could also use frozen green beans or broccoli florets if you prefer.
• After you caramelize the onions, dust them with a bit of flour. This helps thicken everything up. The key is to cook the flour before adding the liquids, so give the onions a good stir. The flour will smell nutty and turn golden when it's cooked.
• If you can't find Gruyére cheese, Swiss will also work.

What Our Readers Say About this Casserole Recipe

This dish has a vocal fanbase. Here are some highlights from our reviewers:

• "This casserole is rich and delicious from the caramelized onions and gruyere. The French-fried onions on top are a crunchy treat."
• "This was a wonderful dish. I served it at a dinner party, and everyone had seconds. I did add extra onions to the recipe (1+ cups) and made sure to caramelize them. I also added some sherry to the chicken broth. As another reviewer noted, I added all of the peas from the small package, which worked out great! I will definitely make this again."
• "This recipe works and tastes great! We roasted our own chicken instead of using a purchased one and had exactly the right amount of meat. The only other change I made was waiting to add the crispy fried onions to the top for the last 8-10 mins of baking time. 30 mins seemed too long, I didn't want them to burn. The dish was a hit!"