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One-skillet French onion chicken with caramelized onions, savory beef pan gravy, and bubbling melted Gruyère cheese

One-Skillet French Onion Chicken (with Melted Gruyère)

This viral one-skillet French onion chicken combines tender, golden-seared chicken breasts smothered in deeply sweet caramelized onions, simmered in a savory herb-infused beef broth pan sauce, and blankets of bubbling, broiled Gruyère and Swiss cheese. All the comforting decadence of classic French onion soup transformed into an effortless 35-minute skillet dinner.
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Prep Time 10 minutes
Cook Time 25 minutes
Total Time 35 minutes
Servings: 4 servings
Course: Dinner, Main Course, Weeknight Meals
Cuisine: Comfort Food, French-American, One Skillet
Calories: 420
Ingredients Method Nutrition Notes

Ingredients
  

Pan-Seared Chicken Breasts
  • 4 pieces (approx. 1.5 lbs) boneless skinless chicken breasts (cutlets, pounded to 1/2-inch uniform thickness)
  • 2 tbsp all-purpose flour (for light dredging)
  • 1 tsp garlic powder
  • 0.5 tsp fine sea salt
  • 0.5 tsp freshly cracked black pepper
  • 2 tbsp extra virgin olive oil
Caramelized Onion & Savory Broth
  • 3 large yellow or Vidalia sweet onions (thinly sliced into half-moons)
  • 2 tbsp unsalted butter
  • 3 cloves garlic (minced)
  • 1.5 cups rich beef bone broth (halal certified)
  • 1 tbsp Worcestershire sauce (or balsamic vinegar for acidity)
  • 1 tbsp fresh thyme leaves (chopped, plus extra sprigs)
Melted Cheesy Crown
  • 1 cup Gruyère cheese (freshly shredded)
  • 0.5 cup Swiss or provolone cheese (shredded)
  • 2 tbsp fresh flat-leaf parsley (chopped, for garnish)

Method
 

Season & Sear the Chicken
  1. Pat chicken cutlets dry with paper towels. Season with garlic powder, salt, and pepper, then lightly dust both sides with flour. Heat olive oil in a large oven-safe cast iron skillet over medium-high heat. Sear chicken for 4 to 5 minutes per side until golden brown and crusty. Transfer to a plate (chicken will finish cooking in the sauce).
Caramelize the Onions
  1. Reduce heat to medium. Add butter to the same skillet. Add the sliced onions and a pinch of salt. Cook, stirring occasionally, for 15 to 18 minutes until deeply golden brown, caramelized, and sweet. If onions start sticking too quickly, add a splash of broth to deglaze the pan.
Build the Rich Pan Sauce
  1. Add minced garlic and fresh thyme to the caramelized onions, sautéing for 60 seconds until aromatic. Pour in the beef bone broth and Worcestershire sauce, scraping up all browned bits from the pan bottom. Simmer for 3 to 4 minutes until the broth reduces slightly into a luscious savory pan sauce.
Assemble & Melt the Cheese
  1. Nestle the seared chicken breasts back into the bed of caramelized onions. Spoon some of the onions and sauce directly over the top of each cutlet. Blanket each piece generously with the shredded Gruyère and Swiss cheeses.
Broil to Golden Perfection
  1. Transfer the skillet under the oven broiler set to HIGH (about 6 inches from the heat source) for 3 to 4 minutes, watching closely until the cheese is completely melted, bubbly, and toasted with golden-brown spots.
Garnish & Serve
  1. Garnish with fresh thyme leaves and chopped parsley. Serve immediately hot from the skillet alongside buttery mashed potatoes or crusty French bread to soak up the phenomenal onion gravy!

Nutrition

Serving: 1gCalories: 420kcalCarbohydrates: 14gProtein: 42gFat: 22gSaturated Fat: 10gCholesterol: 125mgSodium: 640mgPotassium: 620mgFiber: 2.1gSugar: 7.5gVitamin A: 14IUVitamin C: 12mgCalcium: 35mgIron: 16mg

Notes

Chef's Pro Tip: The secret to legendary French onion flavor is giving the onions enough time to caramelize properly without scorching. Don't rush this step! Keep your heat on medium-low and stir every couple of minutes. The natural sugars in the onions break down into deep molasses-like sweetness that balances the savory beef stock and nutty melted Gruyère.

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