French Chicken Casserole – Creamy One-Pan Comfort

This French chicken casserole is the kind of dinner that tastes like it simmered for hours but comes together in a single baking dish on a weeknight. Chicken thighs sear until deeply golden, then bake in a silky sauce of Dijon mustard, white wine, and cream alongside tender sliced potatoes that soak up every drop.

Think of it as a rustic bistro classic made friendly for home cooks. Everything happens in one pan, the oven does most of the work, and the result is a bubbling, aromatic casserole with a sauce rich enough to spoon over rice or crusty bread.

It is also remarkably forgiving. You can swap the wine for broth, use chicken breasts if you prefer, and prep the whole thing ahead so it goes straight from fridge to oven on a busy evening.

About the Ingredients

6 bone-in, skin-on chicken thighs (about 2 1/4 lb / 1 kg)

Bone-in thighs stay juiciest here; if you only have boneless, reduce the bake time by about 10 minutes. Look for thighs with tight, dry skin so they sear and crisp properly.

1 1/2 lb (680 g) Yukon Gold potatoes, sliced 1/4 inch thick

Yukon Golds hold their shape and turn creamy in the sauce; russets work but break down more. No need to peel if the skins are thin and scrubbed.

1 medium yellow onion, thinly sliced

Yellow onion gives sweetness that balances the mustard; a large shallot is a fine substitute for a milder flavor.

3 garlic cloves, minced

Fresh garlic is best, but 1 teaspoon garlic paste works in a pinch. Add it late so it does not burn.

2 tablespoons olive oil

Use a neutral, everyday olive oil for searing; avocado oil is a good high-heat substitute.

3 tablespoons Dijon mustard

Dijon brings the signature tang; whole-grain mustard can replace it for extra texture. Do not use yellow mustard, which is too sharp and thin.

1/2 cup (120 ml) dry white wine

A dry Sauvignon Blanc or Pinot Grigio works well; swap in low-sodium chicken broth plus 1 tablespoon lemon juice if avoiding alcohol.

1 cup (240 ml) heavy cream

Heavy cream gives the silkiest sauce; half-and-half works but can curdle slightly, so add it off the heat.

1 cup (240 ml) low-sodium chicken broth

Low-sodium lets you control the seasoning; vegetable broth is a fine substitute.

1 teaspoon dried thyme

Dried thyme is convenient; use 1 tablespoon fresh thyme leaves if you have it. Rub dried herbs between your fingers to wake them up.

1 teaspoon salt and 1/2 teaspoon black pepper

Kosher salt seasons more evenly than table salt; season the potatoes and chicken separately for balanced flavor.

2 tablespoons chopped fresh parsley, for garnish

Flat-leaf parsley adds brightness; fresh chives or tarragon are lovely alternatives.

Tips & Tricks

Add the cream at the right moment

stir it in after the wine and broth have simmered briefly so the sauce stays smooth, and keep the oven at 375 F (190 C) so it does not split.

Check the chicken with a thermometer

thighs should reach 175 F (79 C) at the thickest part, which guarantees juicy meat rather than guessing by color.

• Do not skip searing the chicken skin-side down first: that rendered fat and golden crust are where much of the flavor comes from, and it keeps the skin from turning flabby in the oven.
• Slice the potatoes evenly, about 1/4 inch thick: uneven slices cook at different rates, leaving some crunchy and some mushy. A mandoline makes this quick and consistent.

Step-by-Step Instructions

1. Preheat and season

Preheat the oven to 375 F (190 C). Pat the chicken thighs dry, then season both sides with half the salt and pepper.

2. Sear the chicken

Heat the olive oil in a large oven-safe skillet over medium-high heat. Sear the chicken skin-side down for 6 to 7 minutes until deeply golden brown, then flip and cook 2 minutes more; transfer to a plate.

3. Soften the aromatics

Lower the heat to medium and add the onion to the same pan, cooking for 4 to 5 minutes until translucent and soft. Stir in the garlic and thyme and cook 30 seconds until fragrant.

4. Build the sauce

Pour in the white wine and scrape up the browned bits, simmering for 2 minutes until reduced by half. Stir in the broth and Dijon mustard, then whisk in the cream and simmer 2 minutes until slightly thickened.

5. Layer the potatoes

Arrange the sliced potatoes in an even layer in a 9×13-inch baking dish, season with the remaining salt and pepper, then pour the creamy sauce evenly over the top.

6. Add the chicken

Nestle the seared chicken thighs skin-side up on top of the potatoes, leaving the skin exposed above the sauce so it stays crisp.

7. Bake until bubbling

Bake uncovered for 35 to 40 minutes, until the sauce is bubbling at the edges and the potatoes are fork-tender. The chicken should read 175 F (79 C) at the thickest part.

8. Rest and garnish

Let the casserole rest for 5 minutes so the sauce settles, then scatter with fresh parsley and serve straight from the dish.

Delicious Variations

Mushroom and Tarragon

Add 8 oz sliced cremini mushrooms with the onion and finish with 1 tablespoon chopped fresh tarragon for an earthy, herbal twist.

Lemon-Dijon Chicken

Stir the zest and juice of 1 lemon into the sauce and use boneless breasts, reducing the bake to 25 to 30 minutes.

Crispy-Topped Casserole

Sprinkle 1/2 cup panko breadcrumbs mixed with 2 tablespoons grated Gruyere over the top for the last 15 minutes of baking.

How to Store French Chicken Casserole

Frequently Asked Questions

Give this French chicken casserole a try this week and let the oven do the heavy lifting. If you make it, snap a photo and leave a comment below telling me how your family liked it.

French Chicken Casserole

This French chicken casserole bakes juicy chicken thighs in a creamy Dijon and white wine sauce with golden potatoes for an easy, comforting one-pan dinner.

★★★★½ 4.8 (214 ratings)

20 minPrep time55 minCook time6Servings612 kcalCalories

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🧂 Ingredients

• 6 bone-in, skin-on chicken thighs (about 2 1/4 lb / 1 kg)
• 1 1/2 lb (680 g) Yukon Gold potatoes, sliced 1/4 inch thick
• 1 medium yellow onion, thinly sliced
• 3 garlic cloves, minced
• 2 tablespoons olive oil
• 3 tablespoons Dijon mustard
• 1/2 cup (120 ml) dry white wine
• 1 cup (240 ml) heavy cream
• 1 cup (240 ml) low-sodium chicken broth
• 1 teaspoon dried thyme
• 1 teaspoon salt and 1/2 teaspoon black pepper
• 2 tablespoons chopped fresh parsley, for garnish

📋 Instructions

1. 1Preheat and season — Preheat the oven to 375 F (190 C). Pat the chicken thighs dry, then season both sides with half the salt and pepper.
2. 2Sear the chicken — Heat the olive oil in a large oven-safe skillet over medium-high heat. Sear the chicken skin-side down for 6 to 7 minutes until deeply golden brown, then flip and cook 2 minutes more; transfer to a plate.
3. 3Soften the aromatics — Lower the heat to medium and add the onion to the same pan, cooking for 4 to 5 minutes until translucent and soft. Stir in the garlic and thyme and cook 30 seconds until fragrant.
4. 4Build the sauce — Pour in the white wine and scrape up the browned bits, simmering for 2 minutes until reduced by half. Stir in the broth and Dijon mustard, then whisk in the cream and simmer 2 minutes until slightly thickened.
5. 5Layer the potatoes — Arrange the sliced potatoes in an even layer in a 9×13-inch baking dish, season with the remaining salt and pepper, then pour the creamy sauce evenly over the top.
6. 6Add the chicken — Nestle the seared chicken thighs skin-side up on top of the potatoes, leaving the skin exposed above the sauce so it stays crisp.
7. 7Bake until bubbling — Bake uncovered for 35 to 40 minutes, until the sauce is bubbling at the edges and the potatoes are fork-tender. The chicken should read 175 F (79 C) at the thickest part.
8. 8Rest and garnish — Let the casserole rest for 5 minutes so the sauce settles, then scatter with fresh parsley and serve straight from the dish.

👨‍🍳 Chef's Note: For the crispest skin, broil the finished casserole for the final 2 minutes, watching closely so the cream does not catch.

Servings: 6

Cuisine: French

Course: Main Course

Nutrition (per serving): 612 kcal · 34g protein · 26g carbs · 41g fat