Quick Chicken Pot Pie Casserole

If you ask me, chicken pot pie casserole is comfort food at its finest.

This easy weeknight dinner takes everything you love about classic chicken pot pie and turns it into a simple one-pan meal. Tender vegetables and juicy chicken simmer in a creamy, herb-flecked sauce that tastes like it took hours to make.

The whole thing gets topped with fluffy, golden biscuits that bake right on top. No rolling out dough or fussing with a pie crust—just pop open a can of refrigerated biscuits and you’re halfway there.

It’s a cozy, filling dish that the whole family will ask for again and again, especially on chilly evenings.

What Kind of Chicken Should I Use?

The great thing about this casserole is that you can use just about any cooked chicken you have on hand. Rotisserie chicken from the grocery store is probably the easiest option and adds tons of flavor without any extra work on your part. Leftover roasted, grilled, or poached chicken works perfectly too, and this is honestly a great way to use up that chicken sitting in your fridge from last night’s dinner. If you’re starting from scratch, you can poach some chicken breasts in simmering water for about 15-20 minutes until cooked through, then shred or dice them up. Just make sure whatever chicken you use is already fully cooked before adding it to the casserole, since it’s just getting reheated in the oven.

Options for Substitutions

This casserole is pretty forgiving when it comes to swapping ingredients:

• Cooked chicken: Use rotisserie chicken for convenience, or swap in cooked turkey, especially great for using up Thanksgiving leftovers. You could even try cooked diced ham for a different flavor profile.
• Vegetables: The onion, carrots, and celery combo is classic, but feel free to add or substitute with mushrooms, green beans, corn, or diced potatoes. Just keep the total amount of vegetables around 3 to 4 cups.
• Milk: Heavy cream will make it richer, while half-and-half works nicely too. In a pinch, you can use additional chicken broth, though the sauce won’t be quite as creamy.
• Refrigerated biscuits: This is really the star of the show for that easy topping, so I’d recommend sticking with them. However, you could use puff pastry sheets cut into squares or even a pie crust cut into strips for a different look.
• Fresh thyme: Dried thyme works perfectly fine here – just use about 1 teaspoon. You could also try dried sage or a poultry seasoning blend for similar flavor.
• Frozen peas: Swap these out for frozen mixed vegetables, corn, or green beans if that’s what you have on hand.

Watch Out for These Mistakes While Baking

The biggest mistake when making chicken pot pie casserole is not cooking the flour long enough in step 3, which can leave you with a raw flour taste – make sure to stir constantly for the full minute to cook it out properly.

Another common error is adding the chicken broth and milk too quickly, which creates lumps in your gravy, so pour them in gradually while whisking constantly to keep the sauce smooth.

Don’t skip simmering the filling for the full 4-5 minutes before transferring it to the baking dish, as this step thickens the sauce to the right consistency and prevents a watery casserole.

Finally, resist the urge to place the biscuits too close together – leaving a little space between them allows hot air to circulate and helps them bake up golden and fluffy instead of steaming and staying doughy.

What to Serve With Chicken Pot Pie Casserole?

Since chicken pot pie casserole is already pretty hearty and loaded with veggies, I like to keep the sides simple and fresh. A crisp green salad with a tangy vinaigrette is perfect for cutting through all that creamy richness, or you could go with some roasted green beans tossed with a little lemon juice. If you want something a bit more filling, cranberry sauce or a simple fruit salad adds a nice sweet contrast to the savory flavors. Honestly though, this casserole is filling enough that you could just serve it with a glass of wine and call it dinner!

Storage Instructions

Store: Keep any leftover casserole covered tightly with foil or in an airtight container in the fridge for up to 4 days. The biscuits might soften a bit as they sit, but the flavors actually get even better the next day!

Freeze: This casserole freezes pretty well for up to 2 months. I recommend freezing it after baking, once it’s completely cooled. Just wrap it tightly in plastic wrap and then foil to prevent freezer burn.

Reheat: Warm individual portions in the microwave for 2-3 minutes, or reheat the whole dish covered with foil in a 350°F oven for about 20-25 minutes until heated through. If reheating from frozen, let it thaw in the fridge overnight first for best results.

Estimated Nutrition

Estimated nutrition for the whole recipe (without optional ingredients):

• Calories: 2400-2700
• Protein: 90-110 g
• Fat: 110-130 g
• Carbohydrates: 260-290 g

Ingredients

For the filling:

• 3 medium celery stalks (diced into 1/2-inch pieces)
• 3 medium carrots (cut into 1/2-inch rounds)
• 10 sprigs fresh thyme
• 0.5 tsp black pepper
• 1 cup frozen peas
• 2 cups chicken broth
• 2 garlic cloves (finely minced)
• 1 cup milk (room temperature works best)
• 1 lb cooked boneless chicken (shredded or cut into bite-sized pieces)
• 1 medium yellow onion (diced into 1/2-inch pieces)
• 1.5 tsp kosher salt
• 4 tbsp unsalted butter (I use Kerrygold for this)
• 1/4 cup all-purpose flour

For the topping:

• 1 (16 oz) can refrigerated jumbo biscuits
• 2 tbsp unsalted butter (melted for brushing)

Step 1: Prepare Ingredients and Preheat Oven

• 3 medium celery stalks
• 3 medium carrots
• 10 sprigs fresh thyme
• 2 garlic cloves
• 1 lb cooked boneless chicken
• 1/4 cup all-purpose flour
• 1 cup frozen peas

Preheat your oven to 375°F.

While it heats, prepare your mise en place: dice the onion and celery into 1/2-inch pieces, cut the carrots into 1/2-inch rounds, finely mince the garlic, and strip the thyme leaves from the sprigs (discard the woody stems).

Have your shredded or bite-sized chicken pieces ready, measure out the flour, and set aside the frozen peas.

Preparing everything upfront ensures smooth cooking without interruptions.

Step 2: Build the Vegetable Base and Bloom the Roux

• 4 tbsp unsalted butter
• 1 medium yellow onion
• 3 medium carrots
• 3 medium celery stalks
• 10 sprigs fresh thyme
• 1.5 tsp kosher salt
• 0.5 tsp black pepper
• 2 garlic cloves
• 1/4 cup all-purpose flour

Melt 4 tablespoons butter in a large skillet over medium heat.

Add the diced onion, carrots, celery, thyme leaves, salt, and black pepper.

Sauté for 5-7 minutes, stirring occasionally, until the vegetables begin to soften and release their aromatics.

Once softened, add the minced garlic and flour, stirring constantly for 30 seconds to 1 minute.

This blooming process cooks out the raw flour taste and creates the base for a silky sauce.

Step 3: Create the Creamy Sauce

• 2 cups chicken broth
• 1 cup milk

Gradually pour in the chicken broth and milk while stirring constantly to prevent lumps from forming.

Bring the mixture to a gentle boil over medium-high heat, then reduce the heat to medium and simmer for 4-5 minutes, stirring occasionally, until the sauce thickens enough to coat the back of a spoon.

I like to simmer longer if the sauce seems too thin—a good filling should coat rather than pool at the bottom of the dish.

Step 4: Combine Filling and Transfer to Baking Dish

• sauce mixture from Step 3
• 1 lb cooked boneless chicken
• 1 cup frozen peas

Remove the skillet from heat and stir in the cooked chicken and frozen peas from Step 1.

Mix gently until everything is evenly distributed throughout the creamy sauce.

Transfer the entire filling mixture into a 9×13-inch baking dish (or similar size casserole dish), spreading it in an even layer.

The filling can be slightly warm or cooled slightly before topping—both work fine.

Step 5: Top with Biscuits and Brush

• 1 can refrigerated jumbo biscuits
• 2 tbsp unsalted butter

Arrange the refrigerated jumbo biscuits directly on top of the filling, spacing them evenly so they’ll cook through without crowding.

Melt 2 tablespoons butter and brush it generously over the top of each biscuit—this creates that beautiful golden-brown finish.

I find it’s easier to brush the biscuits after arranging them rather than before, so the butter stays on top where it belongs.

Step 6: Bake Until Golden and Serve

Place the baking dish in the preheated 375°F oven and bake for 20-30 minutes, until the biscuits are puffed and golden brown on top.

The filling underneath should be gently bubbling around the edges.

Remove from the oven and let rest for 2-3 minutes before serving—this allows the filling to set slightly and makes for cleaner portions.

Quick Chicken Pot Pie Casserole

Delicious Quick Chicken Pot Pie Casserole recipe with step-by-step instructions.

Print Recipe Pin Recipe

Prep Time 20 minutes mins

Cook Time 35 minutes mins

Total Time 55 minutes mins

Servings 6 servings

Calories 2550 kcal

Ingredients

  

For the filling:

• 3 medium celery stalks (diced into 1/2-inch pieces)
• 3 medium carrots (cut into 1/2-inch rounds)
• 10 sprigs fresh thyme
• 0.5 tsp black pepper
• 1 cup frozen peas
• 2 cups chicken broth
• 2 garlic cloves (finely minced)
• 1 cup milk (room temperature works best)
• 1 lb cooked boneless chicken (shredded or cut into bite-sized pieces)
• 1 medium yellow onion (diced into 1/2-inch pieces)
• 1.5 tsp kosher salt
• 4 tbsp unsalted butter (I use Kerrygold for this)
• 1/4 cup all-purpose flour

For the topping:

• 1 (16 oz) can refrigerated jumbo biscuits
• 2 tbsp unsalted butter (melted for brushing)

Instructions

 

• Preheat your oven to 375°F. While it heats, prepare your mise en place: dice the onion and celery into 1/2-inch pieces, cut the carrots into 1/2-inch rounds, finely mince the garlic, and strip the thyme leaves from the sprigs (discard the woody stems). Have your shredded or bite-sized chicken pieces ready, measure out the flour, and set aside the frozen peas. Preparing everything upfront ensures smooth cooking without interruptions.
• Melt 4 tablespoons butter in a large skillet over medium heat. Add the diced onion, carrots, celery, thyme leaves, salt, and black pepper. Sauté for 5-7 minutes, stirring occasionally, until the vegetables begin to soften and release their aromatics. Once softened, add the minced garlic and flour, stirring constantly for 30 seconds to 1 minute. This blooming process cooks out the raw flour taste and creates the base for a silky sauce.
• Gradually pour in the chicken broth and milk while stirring constantly to prevent lumps from forming. Bring the mixture to a gentle boil over medium-high heat, then reduce the heat to medium and simmer for 4-5 minutes, stirring occasionally, until the sauce thickens enough to coat the back of a spoon. I like to simmer longer if the sauce seems too thin—a good filling should coat rather than pool at the bottom of the dish.
• Remove the skillet from heat and stir in the cooked chicken and frozen peas from Step 1. Mix gently until everything is evenly distributed throughout the creamy sauce. Transfer the entire filling mixture into a 9x13-inch baking dish (or similar size casserole dish), spreading it in an even layer. The filling can be slightly warm or cooled slightly before topping—both work fine.
• Arrange the refrigerated jumbo biscuits directly on top of the filling, spacing them evenly so they'll cook through without crowding. Melt 2 tablespoons butter and brush it generously over the top of each biscuit—this creates that beautiful golden-brown finish. I find it's easier to brush the biscuits after arranging them rather than before, so the butter stays on top where it belongs.
• Place the baking dish in the preheated 375°F oven and bake for 20-30 minutes, until the biscuits are puffed and golden brown on top. The filling underneath should be gently bubbling around the edges. Remove from the oven and let rest for 2-3 minutes before serving—this allows the filling to set slightly and makes for cleaner portions.