French Onion Chicken Thighs Bake (Printable version)

Chicken thighs baked with caramelized onions and topped with crispy sourdough and melted cheese.

# What You'll Need:

→ 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 (optional)

# Directions:

01 - Set oven to 375°F (190°C).
02 - Season chicken thighs with salt and pepper. Heat 1 tablespoon olive oil in a large ovenproof skillet or Dutch oven over medium-high heat. Place chicken thighs skin side down and brown for 4-5 minutes until golden. Remove and set aside.
03 - In the same pan, melt butter with 1 tablespoon olive oil. Add sliced onions, sugar, and ¼ teaspoon salt. Cook over medium heat, stirring frequently, until onions are deeply golden and caramelized, approximately 20-25 minutes.
04 - Add minced garlic and thyme, sautéing for 1 minute until fragrant.
05 - Deglaze pan with dry white wine, scraping up browned bits from the bottom. Simmer for 2-3 minutes. Stir in chicken broth, Worcestershire sauce, and Dijon mustard. Return chicken thighs to pan, nestling them skin side up into the onions and sauce.
06 - Transfer pan to preheated oven and bake uncovered for 25 minutes.
07 - While chicken bakes, toss sourdough bread cubes with 1 tablespoon olive oil.
08 - Remove pan from oven after 25 minutes. Sprinkle Gruyère and Parmesan cheeses evenly over chicken and onions, then distribute sourdough cubes across the top.
09 - Return to oven and bake for an additional 15-20 minutes until bread is golden brown and cheese is bubbly.
10 - Remove from oven, sprinkle with fresh parsley if desired, and allow to rest for 5 minutes before serving.

# Expert Advice:

01 -
  • The chicken thighs stay impossibly juicy while the skin gets crispy around the edges, and you barely have to think about it.
  • Those caramelized onions taste like they've been cooking for hours, but you'll have them golden in about 25 minutes if you don't overthink the heat.
  • The sourdough topping gives you that satisfying crunch and richness you'd expect from a fancy restaurant dish, but it's genuinely simple to pull off.
02 -
  • Don't rush the onion caramelization—low and slow is the only way to get that deep, sweet flavor that makes this dish taste nothing like onion soup rushed in 10 minutes.
  • Use stale sourdough, not fresh bread, because fresh bread will soak up sauce and turn gummy instead of getting crispy and textured on top.
03 -
  • Brown the chicken skin-side down first, then let it finish skin-side up in the oven so the skin gets maximum crispiness without getting too dark during the sauté.
  • Save any leftover bread-and-cheese mixture to toast separately next morning—it's too good to waste and makes an excellent snack with coffee.
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