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One-Skillet French Onion Chicken (Easy 30-Minute Dinner)

One-Skillet French Onion Chicken

Tender seared chicken cutlets smothered in sweet caramelized onions, rich savory herb broth, and a golden blanket of melted Gruyère cheese in 35 minutes.
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Prep Time 10 minutes
Cook Time 25 minutes
Total Time 35 minutes
Servings: 4 servings
Course: Dinner, Main Course
Cuisine: Comfort Food, French-American
Calories: 385
Ingredients Method Nutrition

Ingredients
  

Chicken & Sear
  • 2 large chicken breasts
  • 1 tbsp olive oil
  • 0.5 tsp salt
  • 0.25 tsp black pepper
Caramelized Onion Gravy
  • 2 tbsp unsalted butter
  • 3 large yellow onions
  • 3 cloves garlic
  • 1 tbsp fresh thyme
  • 1 tbsp balsamic vinegar
  • 1 tsp Dijon mustard
  • 1 cup beef broth
Cheesy Topping
  • 1 cup Gruyère cheese
  • 0.5 cup mozzarella

Method
 

Cooking Walkthrough
  1. Season chicken cutlets evenly with salt and black pepper on both sides.
  2. Heat olive oil in a 12-inch oven-safe skillet over medium-high heat. Sear chicken 3-4 minutes per side until golden. Transfer to a plate.
  3. Reduce heat to medium, melt butter in the skillet, and add sliced onions with a pinch of salt. Cook 15 minutes, stirring often, until deeply caramelized and soft.
  4. Add minced garlic, fresh thyme, Dijon, and balsamic vinegar; stir for 1 minute. Pour in broth and simmer 2 minutes to lift fond from skillet bottom.
  5. Nestle seared chicken cutlets back into the skillet. Spoon onions over each cutlet, then top generously with Gruyère and mozzarella.
  6. Transfer skillet to a 400°F (200°C) oven or broiler for 4-5 minutes until cheese is bubbly and blistered golden. Garnish with fresh thyme and serve warm.

Nutrition

Calories: 385kcalCarbohydrates: 12gProtein: 42gFat: 19gSaturated Fat: 9gCholesterol: 115mgSodium: 490mgFiber: 2gSugar: 6g

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