French Onion Chicken Pot Pie

This French onion chicken pot pie combines deeply caramelized onions, tender chicken, Gruyère, and a creamy savory filling under a golden puff pastry crust. It has all the rich flavor of French onion soup with the cozy, hearty feel of a classic chicken pot pie.

Why You'll Love This French Onion Chicken Pot Pie

My mom used to make chicken pot pie every fall, and it was always one of my favorite meals growing up. She made the classic version, but I’ve had fun trying different takes on it over the years, like my cheddar bay biscuits chicken pot pie and chicken pot pie with cream of chicken soup. So when I saw this French onion chicken pot pie idea from littlebbanghouse, I had to try making my own version.

I use caramelized onions, red wine, herbs, and Gruyère to give the filling that rich French onion flavor, then combine chicken, carrots, peas, and creamy sauce to keep it hearty like a classic pot pie. My favorite part is using puff pastry squares instead of a pie crust. It bakes up golden and flaky on top, so you get creamy filling and crispy pastry in every serving. It’s perfect for fall dinners, Sunday meals, hosting, or any cold-weather night when you want something extra comforting.

Ingredients You'll Need

• 3 -4 yellow onions, thinly sliced
• 2 carrots, cut into coins
• 2 cloves garlic, minced
• 2 tablespoons flour
• 2 cups chicken or beef broth
• 1 tablespoon Worcestershire sauce
• 3 tablespoons heavy cream
• 1 cup gruyere cheese, divided into 2 portions
• 2 cups shredded chicken
• 1 cup frozen peas
• ¼ cup red wine
• 3 sprigs rosemary
• 3 sprigs thyme
• 2 sheets puff pastry, defrosted and cut into 2-inch by 2-inch squares
• 1 large egg + 1 tablespoon water, for egg wash

Ingredient Notes That Make This French Onion Chicken Pot Pie Better

• Yellow onions: Slice them fairly thin and as evenly as possible so they caramelize at the same rate. Since the onions are a major part of the filling, give them enough time to get deeply golden and sweet.
• Cooked chicken: Rotisserie chicken is the easiest option and works perfectly here. You can also use leftover roasted or baked chicken, just shred or chop it into bite-sized pieces.
• Beef or chicken broth: Beef broth gives the filling a deeper French onion soup flavor, while chicken broth keeps it a little lighter. I prefer beef broth so the French onion flavor stands out more.
• Red wine: The wine adds depth and a little acidity to balance the rich onions, cream, and cheese. Let it reduce well before adding the flour and broth so the filling doesn’t taste overly wine-forward.
• Gruyère cheese: Gruyère is my first choice because its nutty, savory flavor is a classic match for French onion soup. Freshly shredded Gruyère also melts more smoothly than pre-shredded cheese.
• Fresh thyme and rosemary: These add a lot of flavor to the filling, but the rosemary is especially strong, so finely chop the leaves after removing them from the woody stems.
• Puff pastry: Make sure it’s fully thawed but still cold when you cut and arrange it. Puff pastry rises best when it goes into the oven chilled, so return it to the refrigerator for a few minutes if it starts getting soft while you work.

How to Make French Onion Chicken Pot Pie

Step 1: Caramelize the Onions

Add the thinly sliced onions to a large Dutch oven or braiser over medium heat. Cook slowly, stirring occasionally, until they’re soft, deeply golden, and caramelized. Add the carrots and garlic and cook until the carrots begin to soften.

Step 2: Build the French Onion Flavor

Add the thyme and rosemary, then pour in the red wine. Stir well, scraping up anything stuck to the bottom of the pan. Let the wine cook down until it has reduced by about 75% and only a small amount of liquid remains.

Step 3: Make the Creamy Filling

Sprinkle the flour over the onions and stir until fully incorporated. Slowly pour in the broth while stirring, then add the Worcestershire sauce and heavy cream. Add half of the Gruyère and stir until completely melted and the sauce is smooth. Fold in the shredded chicken and frozen peas and cook just until everything is combined and heated through.

Step 4: Add the Puff Pastry

Preheat the oven to 375°F. Spread the remaining Gruyère over the chicken filling. Cut the thawed puff pastry into roughly 2-inch squares and arrange them over the cheese, slightly overlapping if needed to cover the top. Brush the pastry with egg wash.

Step 5: Bake

Bake for 25-30 minutes, or until the filling is bubbling and the puff pastry is puffed and deeply golden brown. Let the French onion chicken pot pie cool for about 5-10 minutes before serving so the filling can thicken slightly.

My Expert Tips for the Best French Onion Chicken Pot Pie

• Don’t make the filling too thick before baking. It should be creamy enough to coat the chicken but still have some movement in the pan. The sauce will continue to thicken in the oven and again as the pot pie cools.
• Use an oven-safe Dutch oven or braiser. Making the filling and baking the pot pie in the same pan keeps cleanup easy and means you don’t lose any of the flavor built up on the bottom of the skillet.
• Keep the heat gentle after adding the cream and Gruyère. Once the dairy goes in, avoid a hard boil. Gentle heat keeps the sauce smooth and helps prevent the cheese from becoming oily or grainy.
• Don’t overmix the chicken and peas. Fold them in just until everything is coated. The chicken is already cooked, so too much stirring can break it down into small pieces.
• Leave a little space between the puff pastry squares. You don’t need a perfectly sealed crust. Small gaps give steam somewhere to escape and create more golden, crispy pastry edges.
• Brush egg wash over the tops, not heavily down the cut sides. Too much egg wash along the edges can seal the pastry layers together and keep them from puffing as much.
• Bake until the filling is bubbling around the edges. A golden pastry top looks done before the filling necessarily is, so I also look for bubbling underneath before taking the pot pie out of the oven.

How to Store French Onion Chicken Pot Pie

In the refrigerator: Store leftover pot pie covered or in an airtight container in the refrigerator for up to 3-4 days. The puff pastry will soften as it sits, so I recommend storing leftovers in larger portions rather than cutting everything into individual servings right away.

In the freezer: Freeze the cooked filling without the puff pastry for up to 2 months. Thaw it overnight in the refrigerator, transfer it to your baking dish, then top with fresh puff pastry and bake. I prefer freezing the filling separately since baked puff pastry loses some of its crisp texture after freezing and reheating.

To reheat: Reheat the pot pie in a 350°F oven until the filling is hot and the puff pastry has crisped back up. The microwave works for a quick serving, but the pastry will be much softer.

Make ahead: The filling can be made up to 2 days in advance. Let it cool, cover, and refrigerate it without the puff pastry. When you’re ready to serve, add the Gruyère and cold puff pastry, brush with egg wash, and bake as directed. This gives you the best flaky, freshly baked crust.

French Onion Chicken Pot Pie FAQs

What is French onion chicken pot pie?

French onion chicken pot pie combines the rich flavors of French onion soup with a creamy chicken pot pie filling. This version has caramelized onions, red wine, herbs, Gruyère, chicken, carrots, and peas topped with flaky puff pastry.

Can I use rotisserie chicken?

Yes. Rotisserie chicken works really well and saves a lot of prep time. Remove the skin, shred or chop the meat, and add about 2 cups directly to the finished filling.

Can I make this without red wine?

Yes. Replace the red wine with an equal amount of beef or chicken broth. You can add a small splash of balsamic vinegar if you want a little extra acidity and depth without using wine.

What can I use instead of Gruyère?

Swiss cheese is the closest easy substitute. Fontina, provolone, or a combination of Swiss and mozzarella will also melt well, although Gruyère gives the filling the most classic French onion flavor.

Why is my chicken pot pie filling too runny?

The filling may need more time to simmer before the chicken and peas are added. The sauce should be creamy and thick enough to coat a spoon before you top it with puff pastry. It will thicken a little more as it bakes and cools.

Can I use pie crust instead of puff pastry?

Yes. A refrigerated or homemade pie crust can be used on top instead. The finished pot pie will have a more traditional crust rather than the light, flaky layers you get from puff pastry.

Can I add mushrooms?

Absolutely. Sauté sliced mushrooms after the onions have caramelized and before adding the wine. They pair especially well with the Gruyère, herbs, and savory French onion filling.

Can I make individual French onion chicken pot pies?

Yes. Divide the filling among oven-safe ramekins, top each one with puff pastry, and brush with egg wash. Smaller pot pies will usually bake more quickly, so start checking them before the full-size pot pie would normally be done.

What should I serve with French onion chicken pot pie?

Since the pot pie is already rich and filling, I like serving it with something simple and fresh, such as a green salad, roasted broccoli, brussels sprouts, or steamed vegetables.