Pioneer Woman French Onion Chicken Casserole

Pioneer Woman French Onion Chicken Casserole layers caramelized onions, rotisserie chicken, cremini mushrooms, baguette slices, gruyere, and parmesan in a beef broth base. Total time is about 1 hour and 40 minutes.

This recipe comes from Ree Drummond on thepioneerwoman.com, where she turns classic French onion soup into a scoopable casserole by layering the brothy onion mixture with sliced baguette and two cheeses. Using store-bought rotisserie chicken keeps the active time manageable.

The onions need a full 20 to 25 minutes over medium-low heat to go dark golden and sweet. Rushing them on high heat gives you soft, pale onions without the deep caramelized flavor that makes this taste like real French onion soup instead of just chicken in broth.

Pioneer Woman French Onion Chicken Casserole

Author: Hamdi Saidani Cooking Method:Baking Cuisine:American Courses:Dinner

Difficulty:BeginnerPrep time: 40 minutesCook time: 55 minutesRest time: 5 minutesTotal time:1 hour 40 minutesServings:8 servingsCalories:493 kcal Best Season:Available

Description

Slow-cooked golden onions and shredded rotisserie chicken simmered in white wine and beef broth, layered with crusty baguette rounds and baked under a thick blanket of melted gruyere and parmesan.

Ingredients

For the Base:

• 5 tbsp salted butter, plus more for the baking dish
• 10 oz (285g) cremini mushrooms, thickly sliced
• 5 medium onions, thinly sliced
• 1 tbsp fresh thyme, chopped
• 1/2 tsp kosher salt
• Black pepper, to taste
• 2 tbsp all-purpose flour
• 1/2 cup (120ml) dry white wine
• 3 cups (720ml) low-sodium beef broth
• 2 cups chopped rotisserie chicken, skin removed

For the Layers:

• 1 long baguette, sliced 1/2 inch (1.3cm) thick
• 2 1/2 cups (285g) shredded gruyere cheese
• 1/2 cup (55g) grated parmesan cheese

Instructions

1. Preheat the oven to 425F (220C) and butter a 9-by-13-inch (23x33cm) baking dish.
2. Brown the mushrooms by melting 1 tablespoon of butter in a large pot over medium-high heat, adding the mushrooms, and cooking without stirring until browned on the bottom, about 2 minutes. Stir and cook until browned all over, 2 to 3 more minutes, then remove to a plate.
3. Caramelize the onions by melting the remaining 4 tablespoons of butter over medium-low heat, adding the sliced onions, and cooking while stirring frequently until dark golden, 20 to 25 minutes.
4. Build the sauce by returning the mushrooms to the pot with the thyme, salt, and pepper. Sprinkle in the flour and stir to coat, letting it toast for one minute. Increase the heat, pour in the wine, and bring to a simmer. Add the broth and chicken, return to a simmer, and cook until thickened, about 3 minutes.
5. Layer the casserole by ladling enough of the onion-chicken mixture into the dish to cover the bottom. Arrange half the baguette slices in a single layer on top, then ladle half the remaining mixture over them and press the bread down with the ladle to submerge. Sprinkle with 1 cup gruyere and 1/4 cup parmesan. Add the remaining baguette slices, top with the rest of the onion-chicken mixture, and finish with the remaining 1 1/2 cups gruyere and 1/4 cup parmesan.
6. Bake covered by tenting foil over the dish so it doesn’t touch the cheese, placing it on a rimmed baking sheet, and baking until bubbly, about 20 minutes. Remove the foil and bake until the top is browned and crusty, about 15 minutes more. Let sit 10 minutes before serving.

Keywords:Pioneer Woman French Onion Chicken Casserole, French Onion Chicken Casserole, Ree Drummond

FAQs

Why cook the mushrooms separately before the onions?

The mushrooms need high heat to brown properly, and they release a lot of moisture in the first minute. Cooking them alone in a hot pan lets that liquid evaporate fast so the mushrooms sear instead of steam.

If you add mushrooms and onions together, the extra moisture drops the pan temperature and nothing caramelizes. Browning the mushrooms first, then setting them aside while the onions cook low and slow, gives you two distinct layers of flavor in the finished sauce.

Why does Ree press the baguette slices down into the liquid?

Submerging the bread lets it soak up the beef broth and onion juices so every layer stays moist after baking. Dry bread sitting on top would toast but never absorb the flavor of the sauce underneath.

The soaked baguette also acts like a thickener between layers, holding the casserole together so you can scoop clean portions. Think of it like the bread in French onion soup that sits in the broth under the cheese, not floating above it.

Can you use a different cheese instead of gruyere?

Swiss cheese is the closest swap because it melts the same way and has a similar nutty flavor. Fontina also works well and browns beautifully under high oven heat. Both will give you that stretchy, golden crust on top.

Avoid pre-shredded bagged cheese here because the anti-caking starch prevents smooth melting. Block gruyere or Swiss shredded at home melts into a thin, even layer that gets properly crusty in the oven without clumping.

Why use rotisserie chicken instead of cooking raw chicken?

Rotisserie chicken is already seasoned and cooked, so it just needs to warm through in the sauce. This cuts the active time significantly and adds roasted flavor that plain poached chicken breast wouldn’t have.

Ree uses this shortcut intentionally because the onions already take 20 to 25 minutes to caramelize. Adding a raw chicken step on top of that would push this recipe past two hours. The rotisserie chicken lets the onions be the star without turning dinner into an all-day project.

How do you store and reheat this casserole?

Cover the dish tightly and refrigerate for up to 3 days. The baguette layers absorb more liquid overnight, so the texture shifts from crusty to soft. That’s normal and doesn’t mean it’s gone bad.

Reheat uncovered at 375F (190C) for 20 to 25 minutes until bubbly and the top crisps again. You can also reheat single portions in the microwave, but you lose the crusty cheese top. For the best results, run reheated portions under the broiler for 2 minutes to re-brown the cheese.