Skillet French Onion Chicken with Gruyère and Sherry
This French onion chicken features seared cutlets in a rich sherry and beef broth reduction, topped with melted gruyère. A one-skillet dinner that tastes like the classic soup.
If you love the deep, savory comfort of a bistro-style soup, this french onion chicken is about to become your new weeknight obsession. We take golden-brown chicken cutlets and nestle them into a mountain of onions that have been caramelized until they are sweet, jammy, and impossibly dark.
This easy french onion chicken relies on a few high-impact ingredients to do the heavy lifting. Deglazing the pan with dry sherry and beef broth creates a glossy, umami-rich sauce that coats every bite, while a thick blanket of broiled gruyère adds that signature salty pull.
The beauty of a french onion chicken skillet is that it feels sophisticated enough for a Saturday dinner party but comes together in a single pan. Serve it alongside a crusty baguette or over a bed of buttery mashed potatoes to soak up every last drop of the onion-laced gravy.
Ingredients
The Chicken
- 1.5 lbs (680g) boneless skinless chicken breasts, sliced into thin cutlets
- 1/2 teaspoon kosher salt
- 1/4 teaspoon black pepper
- 2 tablespoons all-purpose flour
- 2 tablespoons extra-virgin olive oil
The Onions & Sauce
- 3 large yellow onions, thinly sliced (about 6 cups)
- 3 tablespoons unsalted butter
- 1 teaspoon granulated sugar (optional, helps browning)
- 1/2 cup (120ml) dry sherry (or dry white wine)
- 1 cup (240ml) high-quality beef broth
- 1 tablespoon fresh thyme leaves
- 1 tablespoon Worcestershire sauce
The Topping
- 1.5 cups (150g) Gruyère cheese, freshly shredded
- Fresh parsley, chopped for garnish
Instructions
- 1
Season the chicken cutlets on both sides with salt and pepper, then lightly dredge them in the flour, shaking off any excess.
- 2
Heat the olive oil in a large, oven-safe stainless steel or cast-iron skillet over medium-high heat. Sear the chicken until golden brown, about 3 minutes per side, then remove to a plate (the chicken does not need to be fully cooked yet).
- 3
Lower the heat to medium and add the butter to the same skillet. Toss in the sliced onions and sugar, stirring to coat.
- 4
Cook the onions for 20-25 minutes, stirring occasionally, until deeply caramelized and jammy. If they start to stick or burn, add a splash of water to the pan.
- 5
Pour in the sherry to deglaze the skillet, scraping up all the brown bits (fond) from the bottom of the pan with a wooden spoon.
- 6
Add the beef broth, thyme, and Worcestershire sauce. Bring the liquid to a simmer and let it reduce by about a third, usually 3-5 minutes.
- 7
Nestle the seared chicken cutlets back into the onion mixture, spooning some of the sauce over the top.
- 8
Top each piece of chicken generously with the shredded Gruyère cheese.
- 9
Place the skillet under the broiler for 2-3 minutes, or until the cheese is bubbly and spotted with brown.
- 10
Garnish with fresh parsley and serve immediately directly from the skillet.
Nutrition (per serving)
Estimates only — not medical or dietary advice.
- Calories
- 524 kcal
- Protein
- 47 g
- Carbs
- 16 g
- Fat
- 28 g
- Fiber
- 2 g
- Sugar
- 6 g
- Sodium
- 845 mg
Tips
- → Don't rush the onions. Caramelization is a chemical reaction that takes time; if you try to do it in 10 minutes, they will be bitter rather than sweet.
- → Use a box grater for the cheese. Pre-shredded cheeses are coated in potato starch to prevent clumping, which stops them from melting into that classic gooey consistency.
- → If you don't have sherry, a dry vermouth or a crisp Sauvignon Blanc works beautifully to provide that necessary hits of acidity.
- → Ensure your skillet is truly oven-safe (no plastic handles) before putting it under the broiler.
FAQ
Can I use chicken thighs instead of breasts?
Absolutely. Boneless, skinless chicken thighs are excellent in this recipe and are even more forgiving under the broiler. Just increase the initial searing time to 5 minutes per side.
How do I make the sauce thicker?
The flour used to dredge the chicken usually thickens the sauce perfectly. If you prefer it even thicker, whisk 1 teaspoon of cornstarch into the beef broth before adding it to the skillet.
Why does my french onion chicken taste bland?
It usually comes down to the onions or the broth. Ensure the onions are truly dark brown (the color of a penny) and use a low-sodium beef broth so you can control the salt levels yourself.
Can I make this ahead of time?
You can caramelize the onions up to 2 days in advance. When ready to eat, simply sear the chicken and continue with the deglazing and simmering steps.
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