Ingredients
Scale
- 1.5 lbs boneless, skinless chicken breasts (about 2–3 large breasts, or 4 smaller ones), pounded to ½-inch thickness if very thick
- 1 tablespoon olive oil
- 2 tablespoons unsalted butter, divided
- 2 large yellow onions (about 1.5 lbs total), thinly sliced
- 2 cloves garlic, minced
- 1 teaspoon fresh thyme leaves (or ½ teaspoon dried thyme)
- 1 tablespoon all-purpose flour
- ½ cup dry white wine (such as Sauvignon Blanc or Pinot Grigio; optional, can substitute with more broth)
- 1 cup low-sodium beef broth (or chicken broth)
- 1 tablespoon Worcestershire sauce
- ½ teaspoon salt, or to taste
- ¼ teaspoon black pepper, or to taste
- 1 cup shredded Gruyère cheese (Swiss, Provolone, or a mix also works well)
- Fresh parsley or thyme sprigs, for garnish (optional)
Instructions
- Prepare the Chicken: Pat the chicken breasts dry with paper towels. If they are very thick, you can slice them in half horizontally to create thinner cutlets, or pound them to an even ½-inch thickness between two sheets of plastic wrap. This ensures even cooking. Season both sides generously with salt and pepper.
- Sear the Chicken: Heat the olive oil and 1 tablespoon of butter in a large, oven-safe skillet (cast iron is ideal) over medium-high heat. Once the butter is melted and the pan is hot, add the chicken breasts in a single layer (work in batches if necessary to avoid overcrowding). Sear for 3-4 minutes per side, until nicely golden brown. The chicken doesn’t need to be cooked through at this stage. Remove the chicken from the skillet and set aside on a plate.
- Sauté the Onions: Reduce the heat to medium. Add the remaining 1 tablespoon of butter to the same skillet. Add the thinly sliced onions and a pinch of salt (this helps draw out moisture). Cook, stirring occasionally, for 10-12 minutes, until the onions are very soft, deeply golden, and have significantly reduced in volume. Don’t rush this step; this is where the flavor develops. If the pan gets too dry or the onions start to stick excessively, add a tablespoon of water or broth.
- Build the Flavor Base: Add the minced garlic and thyme to the onions and cook for another minute until fragrant. Sprinkle the flour over the onions and stir continuously for 1 minute to cook out the raw flour taste.
- Deglaze and Create the Sauce: If using, pour in the white wine to deglaze the pan, scraping up any browned bits (fond) from the bottom of the skillet with a wooden spoon – this is pure flavor! Let the wine simmer and reduce by about half, about 1-2 minutes.
- Simmer the Sauce: Gradually whisk in the beef broth and Worcestershire sauce. Bring the sauce to a simmer, stirring until it thickens slightly. Taste and adjust seasoning with salt and pepper if needed.
- Return Chicken to Skillet: Nestle the seared chicken breasts back into the skillet, spooning some of the onion sauce over the top of each piece. Let the chicken simmer gently in the sauce for 5-7 minutes, or until cooked through and the internal temperature reaches 165°F (74°C).
- Melt the Cheese: Preheat your oven’s broiler to high. Top each chicken breast generously with the shredded Gruyère cheese.
- Broil to Perfection: Carefully transfer the oven-safe skillet to the oven under the broiler. Broil for 2-4 minutes, watching very closely, until the cheese is melted, bubbly, and lightly golden brown in spots. Be vigilant here, as cheese can go from perfect to burnt quickly under a broiler!
- Rest and Serve: Carefully remove the skillet from the oven. Let the French Onion Chicken rest for 5 minutes before serving. This allows the juices in the chicken to redistribute, resulting in a more tender bite. Garnish with fresh parsley or thyme, if desired.
Nutrition
- Serving Size: One Normal Portion
- Calories: 450-550 kcal
- Fat: 20-30g
- Carbohydrates: 10-15g
- Protein: 45-55g