French Onion Chicken Thighs (Printable View)

Juicy chicken thighs baked with caramelized onions and a crispy sourdough cheese topping.

# Ingredient List:

→ Chicken & Marinade

01 - 8 bone-in, skin-on chicken thighs
02 - 1 tablespoon olive oil
03 - 1 teaspoon salt
04 - ½ teaspoon black pepper

→ Caramelized Onions

05 - 3 large yellow onions, thinly sliced
06 - 2 tablespoons unsalted butter
07 - 1 tablespoon olive oil
08 - 1 teaspoon sugar
09 - ¼ teaspoon salt
10 - 2 cloves garlic, minced
11 - 1 teaspoon fresh thyme leaves or ½ teaspoon dried thyme

→ Sauce

12 - ⅔ cup dry white wine
13 - 1 cup low-sodium chicken broth
14 - 2 teaspoons Worcestershire sauce
15 - 1 tablespoon Dijon mustard

→ Sourdough Topping

16 - 3 cups sourdough bread, cut into 1-inch cubes
17 - 1 tablespoon olive oil
18 - 1 cup grated Gruyère cheese
19 - ¼ cup grated Parmesan cheese
20 - 1 tablespoon fresh parsley, chopped

# How to Make:

01 - Set oven temperature to 375°F and allow 10 minutes for preheating.
02 - Season chicken thighs with salt and pepper. Heat 1 tablespoon olive oil in a large ovenproof skillet over medium-high heat. Place chicken skin side down and sear for 4–5 minutes until skin turns golden brown. Transfer to a plate.
03 - In the same skillet, combine butter and 1 tablespoon olive oil over medium heat. Add sliced onions, sugar, and ¼ teaspoon salt. Cook for 20–25 minutes, stirring frequently, until onions achieve deep golden color and tender texture.
04 - Stir in minced garlic and thyme. Cook for 1 minute until fragrant.
05 - Pour white wine into the skillet, scraping the bottom to release caramelized bits. Simmer for 2–3 minutes. Add chicken broth, Worcestershire sauce, and Dijon mustard. Stir to combine.
06 - Return seared chicken thighs to the skillet, positioning them skin side up among the onions and sauce.
07 - Transfer skillet to preheated oven and bake uncovered for 25 minutes.
08 - While chicken bakes, toss sourdough bread cubes with 1 tablespoon olive oil in a bowl until evenly coated.
09 - Remove skillet from oven. Distribute Gruyère and Parmesan cheese evenly over chicken and onions. Top with prepared sourdough cubes.
10 - Return to oven and bake for 15–20 minutes until bread cubes turn golden and cheese melts completely.
11 - Remove from oven. Sprinkle fresh parsley over the top. Allow to rest for 5 minutes before serving.

# Expert Tips:

01 -
  • The caramelized onions do most of the flavor work, so you get that deep, savory richness without a complicated sauce.
  • Bone-in chicken thighs stay incredibly juicy and forgiving, even if you're not a seasoned baker.
  • That sourdough topping gets golden and crispy while the cheese underneath turns all melty and perfect for soaking up the sauce.
02 -
  • Don't rush the onions—those 20 to 25 minutes are non-negotiable if you want them to taste caramelized and sweet rather than just soft and cooked.
  • Stale sourdough is your friend; I learned this the hard way when fresh bread turned into mush in the moisture, but day-old bread crisps up beautifully.
03 -
  • If your sourdough is very fresh and soft, let it sit uncovered on the counter for a few hours or even overnight to dry out slightly before cubing and using.
  • The Worcestershire sauce and Dijon mustard are small additions that anchor the whole dish, so don't leave them out even if you think they're unnecessary.
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